[ { "sku": "UCPX12", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 60, "D_mm": 130, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "weight_g": 6800, "housing_height_mm": 76.2, "base_length_mm": 286, "bolt_spacing_mm": 203, "bolt_size_mm": 25, "manufacturer_designation": "UCPX12", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX12" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCPX12 is the classic upright pillow block for a 60 mm shaft: insert UCX12D1, housing PX12, two foundation bolts. The UCPX12 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 60 mm; PX12 and UCX12D1 are the separate housing and insert part numbers inside. Shaft size is 60 mm; the cast base stands 76.2 mm to the shaft centre (H), is 286 mm long overall (L), and the two foundation holes on 203 mm centres (J) clear 25 mm M20 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UCX12D1 insert are 63.5 kN dynamic and 40 kN static; the assembled UCPX12 weighs about 6.8 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "UCPX12 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 60 mm journal over time.", "UCPX12 at 60 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 76.2 mm centre height and binds the insert.", "The X insert of UCPX12 is wider and rated above the 2-series part at 60 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX12 needs a prepared horizontal surface at the 76.2 mm centre height: shim both feet with full-width packs so the 286 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX12 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX12D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX12 instead of a flanged unit?", "a": "Choose the UCPX12 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 76.2 mm above the 286 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCPX12 mounted bearing?", "a": "UCPX12 takes a 60 mm shaft (insert UCX12D1, 130 mm OD) and has a unit mass of about 6.8 kg. Housing figures: centre height H 76.2 mm, length L 286 mm, bolt centres J 203 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCPX12 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 60 mm bore. UCPX12 is built from housing PX12 plus insert UCX12D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX12", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP312", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 60, "D_mm": 130, "B_mm": 71, "seal_type": "2RS", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "weight_g": 9400, "housing_height_mm": 85, "base_length_mm": 330, "bolt_spacing_mm": 250, "bolt_size_mm": 25, "manufacturer_designation": "UCP312", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP312" ], "naming_rule_text": "UCP312 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC312D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 60 mm shaft size; the unit is built from insert UC312D1 and housing P312. For layout work on UCP312: the 60 mm shaft centre sits 85 mm above the sole (H), the footprint is 330 mm long (L), bolt centres are 250 mm (J), and the foot holes suit M20 (25 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC312D1 insert are 90.5 kN dynamic and 52 kN static; the assembled UCP312 weighs about 9.4 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The 3-series insert makes UCP312 the highest-rated unit at 60 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP312 needs a prepared horizontal surface at the 85 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.", "When ordering covers for UCP312, note the steel and cast-iron cover executions change the unit mass and envelope but not the 250 mm mounting centres.", "UCP312 at 60 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 85 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCP312 mounted bearing?", "a": "UCP312 takes a 60 mm shaft (insert UC312D1, 130 mm OD) and has a unit mass of about 9.4 kg. Housing figures: centre height H 85 mm, length L 330 mm, bolt centres J 250 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP312 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 60 mm bore. UCP312 is built from housing P312 plus insert UC312D1 (D1 = greasable)." }, { "q": "How is UCP312 locked to the shaft, and how tight should the setscrews be?", "a": "The UC312D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP312 instead of a flanged unit?", "a": "Choose the UCP312 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 85 mm above the 330 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP213", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 65, "D_mm": 120, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "weight_g": 5600, "housing_height_mm": 76.2, "base_length_mm": 265, "bolt_spacing_mm": 203, "bolt_size_mm": 25, "manufacturer_designation": "UCP213", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP213" ], "naming_rule_text": "UCP213 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC213D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 65 mm shaft size; the unit is built from insert UC213D1 and housing P213. For layout work on UCP213: the 65 mm shaft centre sits 76.2 mm above the sole (H), the footprint is 265 mm long (L), bolt centres are 203 mm (J), and the foot holes suit M20 (25 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC213D1 insert are 63.5 kN dynamic and 40 kN static; the assembled UCP213 weighs about 5.6 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The standard 2-series insert in UCP213 is the lightest section at 65 mm — do not substitute it into a position that previously ran an X or 3 unit: the 203 mm mounting may match while the load rating does not.", "As a pillow block, UCP213 needs a prepared horizontal surface at the 76.2 mm centre height: shim both feet with full-width packs so the 265 mm base seats over its full area.", "When ordering covers for UCP213, note the steel and cast-iron cover executions change the unit mass and envelope but not the 203 mm mounting centres.", "At 65 mm bore the 265 mm base of UCP213 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCP213 mounted bearing?", "a": "UCP213 takes a 65 mm shaft (insert UC213D1, 120 mm OD) and has a unit mass of about 5.6 kg. Housing figures: centre height H 76.2 mm, length L 265 mm, bolt centres J 203 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP213 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 65 mm bore. UCP213 is built from housing P213 plus insert UC213D1 (D1 = greasable)." }, { "q": "How is UCP213 locked to the shaft, and how tight should the setscrews be?", "a": "The UC213D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP213 instead of a flanged unit?", "a": "Choose the UCP213 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 76.2 mm above the 265 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP213", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX13", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 65, "D_mm": 140, "B_mm": 74.6, "seal_type": "2RS", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "weight_g": 7100, "housing_height_mm": 76.2, "base_length_mm": 286, "bolt_spacing_mm": 203, "bolt_size_mm": 25, "manufacturer_designation": "UCPX13", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX13" ], "naming_rule_text": "NTN ships the UCPX13 as a matched assembly — UCX13D1 insert swaged into the PX13 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the X code identifies the duty series and the final two digits encode the 65 mm bore. Key mounting figures: centre height H = 76.2 mm, overall base length L = 286 mm, bolt-hole spacing J = 203 mm, and each of the two feet takes a 25 mm (M20) fastener for the 65 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UCX13D1 insert are 69 kN dynamic and 44 kN static; the assembled UCPX13 weighs about 7.1 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "Heavy drives on UCPX13 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The X insert of UCPX13 is wider and rated above the 2-series part at 65 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX13 needs a prepared horizontal surface at the 76.2 mm centre height: shim both feet with full-width packs so the 286 mm base seats over its full area.", "The lip seals and slingers on UCPX13 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the PX13 housing of UCPX13: local heat cracks cast iron and distorts the spherical bore that the insert depends on." ], "faq": [ { "q": "Does UCPX13 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 203 mm bolt centres of UCPX13 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCPX13 mounted bearing?", "a": "UCPX13 takes a 65 mm shaft (insert UCX13D1, 140 mm OD) and has a unit mass of about 7.1 kg. Housing figures: centre height H 76.2 mm, length L 286 mm, bolt centres J 203 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCPX13 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 65 mm bore. UCPX13 is built from housing PX13 plus insert UCX13D1 (D1 = greasable)." }, { "q": "How is UCPX13 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX13D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX13 instead of a flanged unit?", "a": "Choose the UCPX13 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 76.2 mm above the 286 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX13", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP313", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 65, "D_mm": 140, "B_mm": 75, "seal_type": "2RS", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "weight_g": 10000, "housing_height_mm": 90, "base_length_mm": 340, "bolt_spacing_mm": 260, "bolt_size_mm": 25, "manufacturer_designation": "UCP313", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP313" ], "naming_rule_text": "A 65 mm bore upright mounted bearing, NTN UCP313 combines the UC313D1 self-aligning insert with the grey-iron P313 pillow block base. NTN's numbering ties the unit to its components: UCP313 means the P313 housing carrying the UC313D1 insert, with the last two digits denoting the 65 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 90 mm centre height, L 340 mm total length, J 260 mm between the 25 mm bolt holes, and a 65 mm shaft passing through the 140 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC313D1 insert are 103 kN dynamic and 60 kN static; the assembled UCP313 weighs about 10.0 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCP313 needs a prepared horizontal surface at the 90 mm centre height: shim both feet with full-width packs so the 340 mm base seats over its full area.", "The D1 suffix on UC313D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP313 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC313D1 insert of UCP313 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "Heavy drives on UCP313 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The 3-series insert makes UCP313 the highest-rated unit at 65 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCP313 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 65 mm bore. UCP313 is built from housing P313 plus insert UC313D1 (D1 = greasable)." }, { "q": "How is UCP313 locked to the shaft, and how tight should the setscrews be?", "a": "The UC313D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP313 instead of a flanged unit?", "a": "Choose the UCP313 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 90 mm above the 340 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCP313 bearing self-aligning?", "a": "Yes within limits. The UC313D1 insert has a spherical outer diameter that pivots in the P313 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCP313 mounted bearing?", "a": "UCP313 takes a 65 mm shaft (insert UC313D1, 140 mm OD) and has a unit mass of about 10.0 kg. Housing figures: centre height H 90 mm, length L 340 mm, bolt centres J 260 mm, foot holes 25 mm for M20 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP214", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 70, "D_mm": 125, "B_mm": 74.6, "seal_type": "2RS", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "weight_g": 6500, "housing_height_mm": 79.4, "base_length_mm": 266, "bolt_spacing_mm": 210, "bolt_size_mm": 25, "manufacturer_designation": "UCP214", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP214" ], "naming_rule_text": "A 70 mm bore upright mounted bearing, NTN UCP214 combines the UC214D1 self-aligning insert with the grey-iron P214 pillow block base. NTN's numbering ties the unit to its components: UCP214 means the P214 housing carrying the UC214D1 insert, with the last two digits denoting the 70 mm bore in the 2-series duty class. The foundation drawing needs four numbers: H 79.4 mm centre height, L 266 mm total length, J 210 mm between the 25 mm bolt holes, and a 70 mm shaft passing through the 125 mm OD insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UC214D1 insert are 69 kN dynamic and 44 kN static; the assembled UCP214 weighs about 6.5 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCP214 needs a prepared horizontal surface at the 79.4 mm centre height: shim both feet with full-width packs so the 266 mm base seats over its full area.", "The D1 suffix on UC214D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP214 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC214D1 insert of UCP214 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCP214 at 70 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 79.4 mm centre height and binds the insert.", "The standard 2-series insert in UCP214 is the lightest section at 70 mm — do not substitute it into a position that previously ran an X or 3 unit: the 210 mm mounting may match while the load rating does not." ], "faq": [ { "q": "What does the UCP214 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 70 mm bore. UCP214 is built from housing P214 plus insert UC214D1 (D1 = greasable)." }, { "q": "How is UCP214 locked to the shaft, and how tight should the setscrews be?", "a": "The UC214D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP214 instead of a flanged unit?", "a": "Choose the UCP214 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 79.4 mm above the 266 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCP214 bearing self-aligning?", "a": "Yes within limits. The UC214D1 insert has a spherical outer diameter that pivots in the P214 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCP214 mounted bearing?", "a": "UCP214 takes a 70 mm shaft (insert UC214D1, 125 mm OD) and has a unit mass of about 6.5 kg. Housing figures: centre height H 79.4 mm, length L 266 mm, bolt centres J 210 mm, foot holes 25 mm for M20 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX14", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 70, "D_mm": 150, "B_mm": 77.8, "seal_type": "2RS", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "weight_g": 9300, "housing_height_mm": 88.9, "base_length_mm": 330, "bolt_spacing_mm": 229, "bolt_size_mm": 27, "manufacturer_designation": "UCPX14", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX14" ], "naming_rule_text": "UCPX14 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UCX14D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series X, bore code ending in the 70 mm shaft size; the unit is built from insert UCX14D1 and housing PX14. For layout work on UCPX14: the 70 mm shaft centre sits 88.9 mm above the sole (H), the footprint is 330 mm long (L), bolt centres are 229 mm (J), and the foot holes suit M22 (27 mm) bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UCX14D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCPX14 weighs about 9.3 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The X insert of UCPX14 is wider and rated above the 2-series part at 70 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX14 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.", "When ordering covers for UCPX14, note the steel and cast-iron cover executions change the unit mass and envelope but not the 229 mm mounting centres.", "At 70 mm bore the 330 mm base of UCPX14 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCPX14 mounted bearing?", "a": "UCPX14 takes a 70 mm shaft (insert UCX14D1, 150 mm OD) and has a unit mass of about 9.3 kg. Housing figures: centre height H 88.9 mm, length L 330 mm, bolt centres J 229 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX14 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 70 mm bore. UCPX14 is built from housing PX14 plus insert UCX14D1 (D1 = greasable)." }, { "q": "How is UCPX14 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX14D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX14 instead of a flanged unit?", "a": "Choose the UCPX14 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 330 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX14", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP314", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 70, "D_mm": 150, "B_mm": 78, "seal_type": "2RS", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "weight_g": 12000, "housing_height_mm": 95, "base_length_mm": 360, "bolt_spacing_mm": 280, "bolt_size_mm": 27, "manufacturer_designation": "UCP314", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP314" ], "naming_rule_text": "UCP314 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC314D1) pre-assembled in a P314 two-bolt plummer housing. On the nameplate, UCP314 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 70 mm bore; the UC314D1 designation shows the D1 greasable execution. Boundary data for the 70 mm bore: housing centre height 95 mm, base 360 mm, mounting centres 280 mm for M22 fasteners through 27 mm holes; the UC314D1 insert itself is 150 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC314D1 insert are 115 kN dynamic and 68 kN static; the assembled UCP314 weighs about 12.0 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the P314 housing of UCP314: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "At 70 mm bore the 360 mm base of UCP314 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCP314 the highest-rated unit at 70 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP314 needs a prepared horizontal surface at the 95 mm centre height: shim both feet with full-width packs so the 360 mm base seats over its full area." ], "faq": [ { "q": "How is UCP314 locked to the shaft, and how tight should the setscrews be?", "a": "The UC314D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP314 instead of a flanged unit?", "a": "Choose the UCP314 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 95 mm above the 360 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP314 mounted bearing?", "a": "UCP314 takes a 70 mm shaft (insert UC314D1, 150 mm OD) and has a unit mass of about 12.0 kg. Housing figures: centre height H 95 mm, length L 360 mm, bolt centres J 280 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP314 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 70 mm bore. UCP314 is built from housing P314 plus insert UC314D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP215", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 75, "D_mm": 130, "B_mm": 77.8, "seal_type": "2RS", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "weight_g": 7200, "housing_height_mm": 82.6, "base_length_mm": 275, "bolt_spacing_mm": 217, "bolt_size_mm": 25, "manufacturer_designation": "UCP215", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP215" ], "naming_rule_text": "UCP215 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC215D1) pre-assembled in a P215 two-bolt plummer housing. On the nameplate, UCP215 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 75 mm bore; the UC215D1 designation shows the D1 greasable execution. Boundary data for the 75 mm bore: housing centre height 82.6 mm, base 275 mm, mounting centres 217 mm for M20 fasteners through 25 mm holes; the UC215D1 insert itself is 130 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC215D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCP215 weighs about 7.2 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the P215 housing of UCP215: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Heavy drives on UCP215 should have the setscrews re-torqued after the first day; at 75 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The standard 2-series insert in UCP215 is the lightest section at 75 mm — do not substitute it into a position that previously ran an X or 3 unit: the 217 mm mounting may match while the load rating does not.", "As a pillow block, UCP215 needs a prepared horizontal surface at the 82.6 mm centre height: shim both feet with full-width packs so the 275 mm base seats over its full area." ], "faq": [ { "q": "How is UCP215 locked to the shaft, and how tight should the setscrews be?", "a": "The UC215D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP215 instead of a flanged unit?", "a": "Choose the UCP215 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 82.6 mm above the 275 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP215 mounted bearing?", "a": "UCP215 takes a 75 mm shaft (insert UC215D1, 130 mm OD) and has a unit mass of about 7.2 kg. Housing figures: centre height H 82.6 mm, length L 275 mm, bolt centres J 217 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP215 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 75 mm bore. UCP215 is built from housing P215 plus insert UC215D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX15", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 75, "D_mm": 160, "B_mm": 82.6, "seal_type": "2RS", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "weight_g": 10000, "housing_height_mm": 88.9, "base_length_mm": 330, "bolt_spacing_mm": 229, "bolt_size_mm": 27, "manufacturer_designation": "UCPX15", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX15" ], "naming_rule_text": "A 75 mm bore upright mounted bearing, NTN UCPX15 combines the UCX15D1 self-aligning insert with the grey-iron PX15 pillow block base. NTN's numbering ties the unit to its components: UCPX15 means the PX15 housing carrying the UCX15D1 insert, with the last two digits denoting the 75 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 88.9 mm centre height, L 330 mm total length, J 229 mm between the 27 mm bolt holes, and a 75 mm shaft passing through the 160 mm OD insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UCX15D1 insert are 80.5 kN dynamic and 53 kN static; the assembled UCPX15 weighs about 10.0 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCPX15 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.", "The D1 suffix on UCX15D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCPX15 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UCX15D1 insert of UCPX15 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCPX15 at 75 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 88.9 mm centre height and binds the insert.", "The X insert of UCPX15 is wider and rated above the 2-series part at 75 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping." ], "faq": [ { "q": "What does the UCPX15 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 75 mm bore. UCPX15 is built from housing PX15 plus insert UCX15D1 (D1 = greasable)." }, { "q": "How is UCPX15 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX15D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX15 instead of a flanged unit?", "a": "Choose the UCPX15 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 330 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCPX15 bearing self-aligning?", "a": "Yes within limits. The UCX15D1 insert has a spherical outer diameter that pivots in the PX15 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCPX15 mounted bearing?", "a": "UCPX15 takes a 75 mm shaft (insert UCX15D1, 160 mm OD) and has a unit mass of about 10.0 kg. Housing figures: centre height H 88.9 mm, length L 330 mm, bolt centres J 229 mm, foot holes 27 mm for M22 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX15", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP315", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 75, "D_mm": 160, "B_mm": 82, "seal_type": "2RS", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "weight_g": 14000, "housing_height_mm": 100, "base_length_mm": 380, "bolt_spacing_mm": 290, "bolt_size_mm": 27, "manufacturer_designation": "UCP315", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP315" ], "naming_rule_text": "The NTN UCP315 unit pairs a UC315D1 sealed ball bearing insert with a one-piece P315 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP315 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 75 mm; P315 and UC315D1 are the separate housing and insert part numbers inside. Shaft size is 75 mm; the cast base stands 100 mm to the shaft centre (H), is 380 mm long overall (L), and the two foundation holes on 290 mm centres (J) clear 27 mm M22 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC315D1 insert are 126 kN dynamic and 77 kN static; the assembled UCP315 weighs about 14.0 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "UCP315 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 75 mm journal over time.", "UCP315 at 75 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 100 mm centre height and binds the insert.", "The 3-series insert makes UCP315 the highest-rated unit at 75 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP315 needs a prepared horizontal surface at the 100 mm centre height: shim both feet with full-width packs so the 380 mm base seats over its full area.", "At replacement time, measure the 75 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP315 creep identically to the old one." ], "faq": [ { "q": "When should I choose a pillow block like UCP315 instead of a flanged unit?", "a": "Choose the UCP315 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 100 mm above the 380 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP315 unit carry?", "a": "The UC315D1 insert is rated at 126 kN dynamic and 77 kN basic static (fatigue load limit 5.55 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP315 mounted bearing?", "a": "UCP315 takes a 75 mm shaft (insert UC315D1, 160 mm OD) and has a unit mass of about 14.0 kg. Housing figures: centre height H 100 mm, length L 380 mm, bolt centres J 290 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP315 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 75 mm bore. UCP315 is built from housing P315 plus insert UC315D1 (D1 = greasable)." }, { "q": "How is UCP315 locked to the shaft, and how tight should the setscrews be?", "a": "The UC315D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP216", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 80, "D_mm": 140, "B_mm": 82.6, "seal_type": "2RS", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "weight_g": 8700, "housing_height_mm": 88.9, "base_length_mm": 292, "bolt_spacing_mm": 232, "bolt_size_mm": 25, "manufacturer_designation": "UCP216", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP216" ], "naming_rule_text": "The NTN UCP216 unit pairs a UC216D1 sealed ball bearing insert with a one-piece P216 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP216 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 80 mm; P216 and UC216D1 are the separate housing and insert part numbers inside. Shaft size is 80 mm; the cast base stands 88.9 mm to the shaft centre (H), is 292 mm long overall (L), and the two foundation holes on 232 mm centres (J) clear 25 mm M20 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC216D1 insert are 80.5 kN dynamic and 53 kN static; the assembled UCP216 weighs about 8.7 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "UCP216 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 80 mm journal over time.", "At 80 mm bore the 292 mm base of UCP216 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The standard 2-series insert in UCP216 is the lightest section at 80 mm — do not substitute it into a position that previously ran an X or 3 unit: the 232 mm mounting may match while the load rating does not.", "As a pillow block, UCP216 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 292 mm base seats over its full area.", "At replacement time, measure the 80 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP216 creep identically to the old one." ], "faq": [ { "q": "When should I choose a pillow block like UCP216 instead of a flanged unit?", "a": "Choose the UCP216 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 292 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP216 unit carry?", "a": "The UC216D1 insert is rated at 80.5 kN dynamic and 53 kN basic static (fatigue load limit 3.95 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP216 mounted bearing?", "a": "UCP216 takes a 80 mm shaft (insert UC216D1, 140 mm OD) and has a unit mass of about 8.7 kg. Housing figures: centre height H 88.9 mm, length L 292 mm, bolt centres J 232 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP216 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 80 mm bore. UCP216 is built from housing P216 plus insert UC216D1 (D1 = greasable)." }, { "q": "How is UCP216 locked to the shaft, and how tight should the setscrews be?", "a": "The UC216D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX16", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 80, "D_mm": 170, "B_mm": 85.7, "seal_type": "2RS", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "weight_g": 14000, "housing_height_mm": 101.6, "base_length_mm": 381, "bolt_spacing_mm": 283, "bolt_size_mm": 27, "manufacturer_designation": "UCPX16", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX16" ], "naming_rule_text": "UCPX16 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX16D1) pre-assembled in a PX16 two-bolt plummer housing. On the nameplate, UCPX16 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 80 mm bore; the UCX16D1 designation shows the D1 greasable execution. Boundary data for the 80 mm bore: housing centre height 101.6 mm, base 381 mm, mounting centres 283 mm for M22 fasteners through 27 mm holes; the UCX16D1 insert itself is 170 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UCX16D1 insert are 92 kN dynamic and 64 kN static; the assembled UCPX16 weighs about 14.0 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the PX16 housing of UCPX16: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Heavy drives on UCPX16 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The X insert of UCPX16 is wider and rated above the 2-series part at 80 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX16 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 381 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX16 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX16D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX16 instead of a flanged unit?", "a": "Choose the UCPX16 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 381 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCPX16 mounted bearing?", "a": "UCPX16 takes a 80 mm shaft (insert UCX16D1, 170 mm OD) and has a unit mass of about 14.0 kg. Housing figures: centre height H 101.6 mm, length L 381 mm, bolt centres J 283 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX16 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 80 mm bore. UCPX16 is built from housing PX16 plus insert UCX16D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX16", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP316", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 80, "D_mm": 170, "B_mm": 86, "seal_type": "2RS", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "weight_g": 17000, "housing_height_mm": 106, "base_length_mm": 400, "bolt_spacing_mm": 300, "bolt_size_mm": 27, "manufacturer_designation": "UCP316", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP316" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP316 is the classic upright pillow block for a 80 mm shaft: insert UC316D1, housing P316, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 80 mm bore. Key mounting figures: centre height H = 106 mm, overall base length L = 400 mm, bolt-hole spacing J = 300 mm, and each of the two feet takes a 27 mm (M22) fastener for the 80 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC316D1 insert are 136 kN dynamic and 86.5 kN static; the assembled UCP316 weighs about 17.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The 3-series insert makes UCP316 the highest-rated unit at 80 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP316 needs a prepared horizontal surface at the 106 mm centre height: shim both feet with full-width packs so the 400 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UC316D1 insert of UCP316 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "Heavy drives on UCP316 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks." ], "faq": [ { "q": "What are the dimensions of an UCP316 mounted bearing?", "a": "UCP316 takes a 80 mm shaft (insert UC316D1, 170 mm OD) and has a unit mass of about 17.0 kg. Housing figures: centre height H 106 mm, length L 400 mm, bolt centres J 300 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP316 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 80 mm bore. UCP316 is built from housing P316 plus insert UC316D1 (D1 = greasable)." }, { "q": "How is UCP316 locked to the shaft, and how tight should the setscrews be?", "a": "The UC316D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP316 instead of a flanged unit?", "a": "Choose the UCP316 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 106 mm above the 400 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP217", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 85, "D_mm": 150, "B_mm": 85.7, "seal_type": "2RS", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "weight_g": 11000, "housing_height_mm": 95.2, "base_length_mm": 310, "bolt_spacing_mm": 247, "bolt_size_mm": 25, "manufacturer_designation": "UCP217", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP217" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP217 is the classic upright pillow block for a 85 mm shaft: insert UC217D1, housing P217, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 85 mm bore. Key mounting figures: centre height H = 95.2 mm, overall base length L = 310 mm, bolt-hole spacing J = 247 mm, and each of the two feet takes a 25 mm (M20) fastener for the 85 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC217D1 insert are 92 kN dynamic and 64 kN static; the assembled UCP217 weighs about 11.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The standard 2-series insert in UCP217 is the lightest section at 85 mm — do not substitute it into a position that previously ran an X or 3 unit: the 247 mm mounting may match while the load rating does not.", "As a pillow block, UCP217 needs a prepared horizontal surface at the 95.2 mm centre height: shim both feet with full-width packs so the 310 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UC217D1 insert of UCP217 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCP217 at 85 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 95.2 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCP217 mounted bearing?", "a": "UCP217 takes a 85 mm shaft (insert UC217D1, 150 mm OD) and has a unit mass of about 11.0 kg. Housing figures: centre height H 95.2 mm, length L 310 mm, bolt centres J 247 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP217 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 85 mm bore. UCP217 is built from housing P217 plus insert UC217D1 (D1 = greasable)." }, { "q": "How is UCP217 locked to the shaft, and how tight should the setscrews be?", "a": "The UC217D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP217 instead of a flanged unit?", "a": "Choose the UCP217 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 95.2 mm above the 310 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX17", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 85, "D_mm": 180, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "weight_g": 15000, "housing_height_mm": 101.6, "base_length_mm": 381, "bolt_spacing_mm": 283, "bolt_size_mm": 27, "manufacturer_designation": "UCPX17", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX17" ], "naming_rule_text": "The NTN UCPX17 unit pairs a UCX17D1 sealed ball bearing insert with a one-piece PX17 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCPX17 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 85 mm; PX17 and UCX17D1 are the separate housing and insert part numbers inside. Shaft size is 85 mm; the cast base stands 101.6 mm to the shaft centre (H), is 381 mm long overall (L), and the two foundation holes on 283 mm centres (J) clear 27 mm M22 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UCX17D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCPX17 weighs about 15.0 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "UCPX17 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 85 mm journal over time.", "At 85 mm bore the 381 mm base of UCPX17 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The X insert of UCPX17 is wider and rated above the 2-series part at 85 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX17 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 381 mm base seats over its full area.", "At replacement time, measure the 85 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX17 creep identically to the old one." ], "faq": [ { "q": "When should I choose a pillow block like UCPX17 instead of a flanged unit?", "a": "Choose the UCPX17 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 381 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCPX17 unit carry?", "a": "The UCX17D1 insert is rated at 106 kN dynamic and 71.5 kN basic static (fatigue load limit 5 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCPX17 mounted bearing?", "a": "UCPX17 takes a 85 mm shaft (insert UCX17D1, 180 mm OD) and has a unit mass of about 15.0 kg. Housing figures: centre height H 101.6 mm, length L 381 mm, bolt centres J 283 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX17 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 85 mm bore. UCPX17 is built from housing PX17 plus insert UCX17D1 (D1 = greasable)." }, { "q": "How is UCPX17 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX17D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX17", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP317", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 85, "D_mm": 180, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "weight_g": 19000, "housing_height_mm": 112, "base_length_mm": 420, "bolt_spacing_mm": 320, "bolt_size_mm": 33, "manufacturer_designation": "UCP317", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP317" ], "naming_rule_text": "NTN ships the UCP317 as a matched assembly — UC317D1 insert swaged into the P317 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 85 mm shaft size; the unit is built from insert UC317D1 and housing P317. For layout work on UCP317: the 85 mm shaft centre sits 112 mm above the sole (H), the footprint is 420 mm long (L), bolt centres are 320 mm (J), and the foot holes suit M27 (33 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC317D1 insert are 147 kN dynamic and 97 kN static; the assembled UCP317 weighs about 19.0 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCP317 the highest-rated unit at 85 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP317 needs a prepared horizontal surface at the 112 mm centre height: shim both feet with full-width packs so the 420 mm base seats over its full area.", "Do not confuse UCP317 with a bare UC317D1 bearing: replacing only the insert is possible, but the housing P317 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP317, note the steel and cast-iron cover executions change the unit mass and envelope but not the 320 mm mounting centres.", "At 85 mm bore the 420 mm base of UCP317 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCP317 mounted bearing?", "a": "UCP317 takes a 85 mm shaft (insert UC317D1, 180 mm OD) and has a unit mass of about 19.0 kg. Housing figures: centre height H 112 mm, length L 420 mm, bolt centres J 320 mm, foot holes 33 mm for M27 bolts." }, { "q": "What does the UCP317 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 85 mm bore. UCP317 is built from housing P317 plus insert UC317D1 (D1 = greasable)." }, { "q": "How is UCP317 locked to the shaft, and how tight should the setscrews be?", "a": "The UC317D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP317 instead of a flanged unit?", "a": "Choose the UCP317 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 112 mm above the 420 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP317 unit?", "a": "There is no single interval for UCP317: the UC317D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP218", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 90, "D_mm": 160, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "weight_g": 13000, "housing_height_mm": 101.6, "base_length_mm": 327, "bolt_spacing_mm": 262, "bolt_size_mm": 27, "manufacturer_designation": "UCP218", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP218" ], "naming_rule_text": "NTN ships the UCP218 as a matched assembly — UC218D1 insert swaged into the P218 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 90 mm shaft size; the unit is built from insert UC218D1 and housing P218. For layout work on UCP218: the 90 mm shaft centre sits 101.6 mm above the sole (H), the footprint is 327 mm long (L), bolt centres are 262 mm (J), and the foot holes suit M22 (27 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC218D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCP218 weighs about 13.0 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The standard 2-series insert in UCP218 is the lightest section at 90 mm — do not substitute it into a position that previously ran an X or 3 unit: the 262 mm mounting may match while the load rating does not.", "As a pillow block, UCP218 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 327 mm base seats over its full area.", "Do not confuse UCP218 with a bare UC218D1 bearing: replacing only the insert is possible, but the housing P218 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP218, note the steel and cast-iron cover executions change the unit mass and envelope but not the 262 mm mounting centres.", "Heavy drives on UCP218 should have the setscrews re-torqued after the first day; at 90 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks." ], "faq": [ { "q": "What are the dimensions of an UCP218 mounted bearing?", "a": "UCP218 takes a 90 mm shaft (insert UC218D1, 160 mm OD) and has a unit mass of about 13.0 kg. Housing figures: centre height H 101.6 mm, length L 327 mm, bolt centres J 262 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP218 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 90 mm bore. UCP218 is built from housing P218 plus insert UC218D1 (D1 = greasable)." }, { "q": "How is UCP218 locked to the shaft, and how tight should the setscrews be?", "a": "The UC218D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP218 instead of a flanged unit?", "a": "Choose the UCP218 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 327 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP218 unit?", "a": "There is no single interval for UCP218: the UC218D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX18", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 90, "D_mm": 190, "B_mm": 104, "seal_type": "2RS", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "weight_g": 16000, "housing_height_mm": 101.6, "base_length_mm": 381, "bolt_spacing_mm": 283, "bolt_size_mm": 27, "manufacturer_designation": "UCPX18", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX18" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCPX18 is the classic upright pillow block for a 90 mm shaft: insert UCX18D1, housing PX18, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the X code identifies the duty series and the final two digits encode the 90 mm bore. Key mounting figures: centre height H = 101.6 mm, overall base length L = 381 mm, bolt-hole spacing J = 283 mm, and each of the two feet takes a 27 mm (M22) fastener for the 90 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UCX18D1 insert are 121 kN dynamic and 82 kN static; the assembled UCPX18 weighs about 16.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The X insert of UCPX18 is wider and rated above the 2-series part at 90 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX18 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 381 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UCX18D1 insert of UCPX18 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCPX18 at 90 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 101.6 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCPX18 mounted bearing?", "a": "UCPX18 takes a 90 mm shaft (insert UCX18D1, 190 mm OD) and has a unit mass of about 16.0 kg. Housing figures: centre height H 101.6 mm, length L 381 mm, bolt centres J 283 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX18 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 90 mm bore. UCPX18 is built from housing PX18 plus insert UCX18D1 (D1 = greasable)." }, { "q": "How is UCPX18 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX18D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX18 instead of a flanged unit?", "a": "Choose the UCPX18 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 381 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX18", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP318", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 90, "D_mm": 190, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "weight_g": 22000, "housing_height_mm": 118, "base_length_mm": 430, "bolt_spacing_mm": 330, "bolt_size_mm": 33, "manufacturer_designation": "UCP318", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP318" ], "naming_rule_text": "UCP318 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC318D1 insert. NTN's numbering ties the unit to its components: UCP318 means the P318 housing carrying the UC318D1 insert, with the last two digits denoting the 90 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 118 mm centre height, L 430 mm total length, J 330 mm between the 33 mm bolt holes, and a 90 mm shaft passing through the 190 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC318D1 insert are 158 kN dynamic and 107 kN static; the assembled UCP318 weighs about 22.0 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "UCP318 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 90 mm journal over time.", "UCP318 at 90 mm uses M27 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 118 mm centre height and binds the insert.", "The 3-series insert makes UCP318 the highest-rated unit at 90 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP318 needs a prepared horizontal surface at the 118 mm centre height: shim both feet with full-width packs so the 430 mm base seats over its full area." ], "faq": [ { "q": "How is UCP318 locked to the shaft, and how tight should the setscrews be?", "a": "The UC318D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP318 instead of a flanged unit?", "a": "Choose the UCP318 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 118 mm above the 430 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP318 mounted bearing?", "a": "UCP318 takes a 90 mm shaft (insert UC318D1, 190 mm OD) and has a unit mass of about 22.0 kg. Housing figures: centre height H 118 mm, length L 430 mm, bolt centres J 330 mm, foot holes 33 mm for M27 bolts." }, { "q": "What does the UCP318 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 90 mm bore. UCP318 is built from housing P318 plus insert UC318D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP319", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 95, "D_mm": 200, "B_mm": 103, "seal_type": "2RS", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "weight_g": 26000, "housing_height_mm": 125, "base_length_mm": 470, "bolt_spacing_mm": 360, "bolt_size_mm": 36, "manufacturer_designation": "UCP319", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP319" ], "naming_rule_text": "A 95 mm bore upright mounted bearing, NTN UCP319 combines the UC319D1 self-aligning insert with the grey-iron P319 pillow block base. On the nameplate, UCP319 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 95 mm bore; the UC319D1 designation shows the D1 greasable execution. Boundary data for the 95 mm bore: housing centre height 125 mm, base 470 mm, mounting centres 360 mm for M30 fasteners through 36 mm holes; the UC319D1 insert itself is 200 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC319D1 insert are 169 kN dynamic and 119 kN static; the assembled UCP319 weighs about 26.0 kg.", "applications": [ "ship-loader and stacker drives", "mining and port conveyor pulleys", "primary crusher feeders", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "The lip seals and slingers on UCP319 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P319 housing of UCP319: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Foundation design for UCP319 must resist the belt-pull reaction at 125 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCP319 the highest-rated unit at 95 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP319 needs a prepared horizontal surface at the 125 mm centre height: shim both feet with full-width packs so the 470 mm base seats over its full area." ], "faq": [ { "q": "How is UCP319 locked to the shaft, and how tight should the setscrews be?", "a": "The UC319D1 insert uses two collar setscrews on the 95 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP319 instead of a flanged unit?", "a": "Choose the UCP319 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 125 mm above the 470 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCP319 unit?", "a": "Yes — UCP319 is an assembly of the P319 housing and UC319D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 95 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCP319 mounted bearing?", "a": "UCP319 takes a 95 mm shaft (insert UC319D1, 200 mm OD) and has a unit mass of about 26.0 kg. Housing figures: centre height H 125 mm, length L 470 mm, bolt centres J 360 mm, foot holes 36 mm for M30 bolts." }, { "q": "What does the UCP319 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 95 mm bore. UCP319 is built from housing P319 plus insert UC319D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP320", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 100, "D_mm": 215, "B_mm": 108, "seal_type": "2RS", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "weight_g": 33000, "housing_height_mm": 140, "base_length_mm": 490, "bolt_spacing_mm": 380, "bolt_size_mm": 36, "manufacturer_designation": "UCP320", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP320" ], "naming_rule_text": "NTN ships the UCP320 as a matched assembly — UC320D1 insert swaged into the P320 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 100 mm bore. Key mounting figures: centre height H = 140 mm, overall base length L = 490 mm, bolt-hole spacing J = 380 mm, and each of the two feet takes a 36 mm (M30) fastener for the 100 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC320D1 insert are 192 kN dynamic and 141 kN static; the assembled UCP320 weighs about 33.0 kg.", "applications": [ "large induced-draft fans", "quarry and aggregate screens", "ship-loader and stacker drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "At 100 mm bore, rigging and alignment dominate the UCP320 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.", "The 3-series insert makes UCP320 the highest-rated unit at 100 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP320 needs a prepared horizontal surface at the 140 mm centre height: shim both feet with full-width packs so the 490 mm base seats over its full area.", "Do not confuse UCP320 with a bare UC320D1 bearing: replacing only the insert is possible, but the housing P320 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP320, note the steel and cast-iron cover executions change the unit mass and envelope but not the 380 mm mounting centres." ], "faq": [ { "q": "Does UCP320 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 380 mm bolt centres of UCP320 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCP320 mounted bearing?", "a": "UCP320 takes a 100 mm shaft (insert UC320D1, 215 mm OD) and has a unit mass of about 33.0 kg. Housing figures: centre height H 140 mm, length L 490 mm, bolt centres J 380 mm, foot holes 36 mm for M30 bolts." }, { "q": "What does the UCP320 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 100 mm bore. UCP320 is built from housing P320 plus insert UC320D1 (D1 = greasable)." }, { "q": "How is UCP320 locked to the shaft, and how tight should the setscrews be?", "a": "The UC320D1 insert uses two collar setscrews on the 100 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP320 instead of a flanged unit?", "a": "Choose the UCP320 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 140 mm above the 490 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP320", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX20", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 100, "D_mm": 215, "B_mm": 117.5, "seal_type": "2RS", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "weight_g": 25000, "housing_height_mm": 127, "base_length_mm": 432, "bolt_spacing_mm": 337, "bolt_size_mm": 33, "manufacturer_designation": "UCPX20", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX20" ], "naming_rule_text": "The NTN UCPX20 unit pairs a UCX20D1 sealed ball bearing insert with a one-piece PX20 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCPX20 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 100 mm bore; the UCX20D1 designation shows the D1 greasable execution. Boundary data for the 100 mm bore: housing centre height 127 mm, base 432 mm, mounting centres 337 mm for M27 fasteners through 33 mm holes; the UCX20D1 insert itself is 215 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UCX20D1 insert are 147 kN dynamic and 105 kN static; the assembled UCPX20 weighs about 25.0 kg.", "applications": [ "primary crusher feeders", "steel-plant roller tables", "large induced-draft fans", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "At replacement time, measure the 100 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX20 creep identically to the old one.", "UCPX20 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 100 mm journal over time.", "At 100 mm bore, rigging and alignment dominate the UCPX20 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.", "The X insert of UCPX20 is wider and rated above the 2-series part at 100 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX20 needs a prepared horizontal surface at the 127 mm centre height: shim both feet with full-width packs so the 432 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX20 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX20D1 insert uses two collar setscrews on the 100 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX20 instead of a flanged unit?", "a": "Choose the UCPX20 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 127 mm above the 432 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCPX20 unit?", "a": "Yes — UCPX20 is an assembly of the PX20 housing and UCX20D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 100 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCPX20 mounted bearing?", "a": "UCPX20 takes a 100 mm shaft (insert UCX20D1, 215 mm OD) and has a unit mass of about 25.0 kg. Housing figures: centre height H 127 mm, length L 432 mm, bolt centres J 337 mm, foot holes 33 mm for M27 bolts." }, { "q": "What does the UCPX20 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 100 mm bore. UCPX20 is built from housing PX20 plus insert UCX20D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX20", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP321", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 105, "D_mm": 225, "B_mm": 112, "seal_type": "2RS", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "weight_g": 35000, "housing_height_mm": 140, "base_length_mm": 490, "bolt_spacing_mm": 380, "bolt_size_mm": 36, "manufacturer_designation": "UCP321", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP321" ], "naming_rule_text": "UCP321 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC321D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 105 mm shaft size; the unit is built from insert UC321D1 and housing P321. For layout work on UCP321: the 105 mm shaft centre sits 140 mm above the sole (H), the footprint is 490 mm long (L), bolt centres are 380 mm (J), and the foot holes suit M30 (36 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC321D1 insert are 204 kN dynamic and 153 kN static; the assembled UCP321 weighs about 35.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "UCP321 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 105 mm journal over time.", "XL units like UCP321 (105 mm bore, M30 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCP321 the highest-rated unit at 105 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP321 needs a prepared horizontal surface at the 140 mm centre height: shim both feet with full-width packs so the 490 mm base seats over its full area." ], "faq": [ { "q": "How is UCP321 locked to the shaft, and how tight should the setscrews be?", "a": "The UC321D1 insert uses two collar setscrews on the 105 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP321 instead of a flanged unit?", "a": "Choose the UCP321 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 140 mm above the 490 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP321 mounted bearing?", "a": "UCP321 takes a 105 mm shaft (insert UC321D1, 225 mm OD) and has a unit mass of about 35.0 kg. Housing figures: centre height H 140 mm, length L 490 mm, bolt centres J 380 mm, foot holes 36 mm for M30 bolts." }, { "q": "What does the UCP321 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 105 mm bore. UCP321 is built from housing P321 plus insert UC321D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP321", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP322", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 110, "D_mm": 240, "B_mm": 117, "seal_type": "2RS", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "weight_g": 43000, "housing_height_mm": 150, "base_length_mm": 520, "bolt_spacing_mm": 400, "bolt_size_mm": 40, "manufacturer_designation": "UCP322", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP322" ], "naming_rule_text": "A 110 mm bore upright mounted bearing, NTN UCP322 combines the UC322D1 self-aligning insert with the grey-iron P322 pillow block base. NTN's numbering ties the unit to its components: UCP322 means the P322 housing carrying the UC322D1 insert, with the last two digits denoting the 110 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 150 mm centre height, L 520 mm total length, J 400 mm between the 40 mm bolt holes, and a 110 mm shaft passing through the 240 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC322D1 insert are 227 kN dynamic and 179 kN static; the assembled UCP322 weighs about 43.0 kg.", "applications": [ "ship-loader and stacker drives", "mining and port conveyor pulleys", "primary crusher feeders", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCP322 needs a prepared horizontal surface at the 150 mm centre height: shim both feet with full-width packs so the 520 mm base seats over its full area.", "The lip seals and slingers on UCP322 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P322 housing of UCP322: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Foundation design for UCP322 must resist the belt-pull reaction at 150 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCP322 the highest-rated unit at 110 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCP322 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 110 mm bore. UCP322 is built from housing P322 plus insert UC322D1 (D1 = greasable)." }, { "q": "How is UCP322 locked to the shaft, and how tight should the setscrews be?", "a": "The UC322D1 insert uses two collar setscrews on the 110 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP322 instead of a flanged unit?", "a": "Choose the UCP322 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 150 mm above the 520 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCP322 bearing self-aligning?", "a": "Yes within limits. The UC322D1 insert has a spherical outer diameter that pivots in the P322 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCP322 mounted bearing?", "a": "UCP322 takes a 110 mm shaft (insert UC322D1, 240 mm OD) and has a unit mass of about 43.0 kg. Housing figures: centre height H 150 mm, length L 520 mm, bolt centres J 400 mm, foot holes 40 mm for M33 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP322", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP324", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 120, "D_mm": 260, "B_mm": 126, "seal_type": "2RS", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "weight_g": 50000, "housing_height_mm": 160, "base_length_mm": 570, "bolt_spacing_mm": 450, "bolt_size_mm": 40, "manufacturer_designation": "UCP324", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP324" ], "naming_rule_text": "The NTN UCP324 unit pairs a UC324D1 sealed ball bearing insert with a one-piece P324 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP324 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 120 mm; P324 and UC324D1 are the separate housing and insert part numbers inside. Shaft size is 120 mm; the cast base stands 160 mm to the shaft centre (H), is 570 mm long overall (L), and the two foundation holes on 450 mm centres (J) clear 40 mm M33 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC324D1 insert are 229 kN dynamic and 185 kN static; the assembled UCP324 weighs about 50.0 kg.", "applications": [ "primary crusher feeders", "steel-plant roller tables", "large induced-draft fans", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Self-aligning is not the same as free to move: the UC324D1 insert of UCP324 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "XL units like UCP324 (120 mm bore, M33 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCP324 the highest-rated unit at 120 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP324 needs a prepared horizontal surface at the 160 mm centre height: shim both feet with full-width packs so the 570 mm base seats over its full area.", "The D1 suffix on UC324D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP324 on site accepts relubrication." ], "faq": [ { "q": "When should I choose a pillow block like UCP324 instead of a flanged unit?", "a": "Choose the UCP324 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 160 mm above the 570 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP324 unit carry?", "a": "The UC324D1 insert is rated at 229 kN dynamic and 185 kN basic static (fatigue load limit 10.5 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP324 mounted bearing?", "a": "UCP324 takes a 120 mm shaft (insert UC324D1, 260 mm OD) and has a unit mass of about 50.0 kg. Housing figures: centre height H 160 mm, length L 570 mm, bolt centres J 450 mm, foot holes 40 mm for M33 bolts." }, { "q": "What does the UCP324 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 120 mm bore. UCP324 is built from housing P324 plus insert UC324D1 (D1 = greasable)." }, { "q": "How is UCP324 locked to the shaft, and how tight should the setscrews be?", "a": "The UC324D1 insert uses two collar setscrews on the 120 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP326", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 130, "D_mm": 280, "B_mm": 135, "seal_type": "2RS", "dynamic_load_kN": 254, "static_load_kN": 214, "fatigue_load_limit_kN": 11.7, "weight_g": 69000, "housing_height_mm": 180, "base_length_mm": 600, "bolt_spacing_mm": 480, "bolt_size_mm": 40, "manufacturer_designation": "UCP326", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP326" ], "naming_rule_text": "NTN ships the UCP326 as a matched assembly — UC326D1 insert swaged into the P326 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 130 mm shaft size; the unit is built from insert UC326D1 and housing P326. For layout work on UCP326: the 130 mm shaft centre sits 180 mm above the sole (H), the footprint is 600 mm long (L), bolt centres are 480 mm (J), and the foot holes suit M33 (40 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC326D1 insert are 254 kN dynamic and 214 kN static; the assembled UCP326 weighs about 69.0 kg.", "applications": [ "large induced-draft fans", "quarry and aggregate screens", "ship-loader and stacker drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCP326 the highest-rated unit at 130 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP326 needs a prepared horizontal surface at the 180 mm centre height: shim both feet with full-width packs so the 600 mm base seats over its full area.", "At replacement time, measure the 130 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP326 creep identically to the old one.", "UCP326 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 130 mm journal over time.", "At 130 mm bore, rigging and alignment dominate the UCP326 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted." ], "faq": [ { "q": "What are the dimensions of an UCP326 mounted bearing?", "a": "UCP326 takes a 130 mm shaft (insert UC326D1, 280 mm OD) and has a unit mass of about 69.0 kg. Housing figures: centre height H 180 mm, length L 600 mm, bolt centres J 480 mm, foot holes 40 mm for M33 bolts." }, { "q": "What does the UCP326 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 130 mm bore. UCP326 is built from housing P326 plus insert UC326D1 (D1 = greasable)." }, { "q": "How is UCP326 locked to the shaft, and how tight should the setscrews be?", "a": "The UC326D1 insert uses two collar setscrews on the 130 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP326 instead of a flanged unit?", "a": "Choose the UCP326 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 180 mm above the 600 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP326 unit?", "a": "There is no single interval for UCP326: the UC326D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP326", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP328", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 140, "D_mm": 300, "B_mm": 145, "seal_type": "2RS", "dynamic_load_kN": 280, "static_load_kN": 246, "fatigue_load_limit_kN": 13, "weight_g": 84000, "housing_height_mm": 200, "base_length_mm": 620, "bolt_spacing_mm": 500, "bolt_size_mm": 40, "manufacturer_designation": "UCP328", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP328" ], "naming_rule_text": "A 140 mm bore upright mounted bearing, NTN UCP328 combines the UC328D1 self-aligning insert with the grey-iron P328 pillow block base. On the nameplate, UCP328 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 140 mm bore; the UC328D1 designation shows the D1 greasable execution. Boundary data for the 140 mm bore: housing centre height 200 mm, base 620 mm, mounting centres 500 mm for M33 fasteners through 40 mm holes; the UC328D1 insert itself is 300 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC328D1 insert are 280 kN dynamic and 246 kN static; the assembled UCP328 weighs about 84.0 kg.", "applications": [ "ship-loader and stacker drives", "mining and port conveyor pulleys", "primary crusher feeders", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "Do not confuse UCP328 with a bare UC328D1 bearing: replacing only the insert is possible, but the housing P328 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP328, note the steel and cast-iron cover executions change the unit mass and envelope but not the 500 mm mounting centres.", "Foundation design for UCP328 must resist the belt-pull reaction at 200 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCP328 the highest-rated unit at 140 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP328 needs a prepared horizontal surface at the 200 mm centre height: shim both feet with full-width packs so the 620 mm base seats over its full area." ], "faq": [ { "q": "How is UCP328 locked to the shaft, and how tight should the setscrews be?", "a": "The UC328D1 insert uses two collar setscrews on the 140 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP328 instead of a flanged unit?", "a": "Choose the UCP328 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 200 mm above the 620 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCP328 unit?", "a": "Yes — UCP328 is an assembly of the P328 housing and UC328D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 140 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCP328 mounted bearing?", "a": "UCP328 takes a 140 mm shaft (insert UC328D1, 300 mm OD) and has a unit mass of about 84.0 kg. Housing figures: centre height H 200 mm, length L 620 mm, bolt centres J 500 mm, foot holes 40 mm for M33 bolts." }, { "q": "What does the UCP328 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 140 mm bore. UCP328 is built from housing P328 plus insert UC328D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP328", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL201", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 12, "D_mm": 32, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 500, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL201", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL201" ], "naming_rule_text": "UCFL201 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC201D1 ball bearing insert pre-assembled in a FL204 cast-iron flange housing. The UCFL201 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 12 mm; FL204 and UC201D1 are the separate housing and insert part numbers inside. Shaft size is 12 mm; the 113 mm overall-height flange is 60 mm long across the rhombus (L), with its two mounting holes on 90 mm centres (J) clearing 12 mm M10 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC201D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL201 weighs about 0.5 kg.", "applications": [ "light belt and roller conveyors", "small packaging and labelling machines", "appliance and HVAC OEM drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "Never weld a bracket to the FL204 housing of UCFL201: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Small units like UCFL201 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 12 mm bore or the points strip out of the shaft.", "The standard 2-series insert in UCFL201 is the lightest section at 12 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL201 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL201 locked to the shaft, and how tight should the setscrews be?", "a": "The UC201D1 insert uses two collar setscrews on the 12 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL201 instead of a pillow block?", "a": "Choose the UCFL201 two-bolt flange when the 12 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL201 mounted bearing?", "a": "UCFL201 takes a 12 mm shaft (insert UC201D1, 32 mm OD) and has a unit mass of about 0.5 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." }, { "q": "What does the UCFL201 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 12 mm bore. UCFL201 is built from housing FL204 plus insert UC201D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL202", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 15, "D_mm": 35, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 500, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL202", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL202" ], "naming_rule_text": "The NTN UCFL202 flanged unit combines a sealed UC202D1 insert with a diamond-shaped FL204 cast-iron housing that bolts flat against a machine frame. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 15 mm bore. Key mounting figures: flange height H = 113 mm, overall length L = 60 mm across the diamond, bolt centres J = 90 mm, and each ear takes a 12 mm (M10) fastener for the 15 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 12–20 mm bore these are the light-drive units: small conveyors, packaging machines and appliance-grade equipment, where the cast housing is over-engineered relative to the load but forgiving of imperfect mounts. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC202D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL202 weighs about 0.5 kg.", "applications": [ "small packaging and labelling machines", "appliance and HVAC OEM drives", "food-table and bottle-line rollers", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "At 15 mm bore the unit is cheap but the shaft is slender: a bent or undersized shaft, not the bearing, is the usual failure cause for UCFL202, so check journal straightness before fitting.", "The standard 2-series insert in UCFL202 is the lightest section at 15 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL202 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "At replacement time, measure the 15 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL202 creep identically to the old one.", "UCFL202 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 15 mm journal over time." ], "faq": [ { "q": "Does UCFL202 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 90 mm bolt centres of UCFL202 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCFL202 mounted bearing?", "a": "UCFL202 takes a 15 mm shaft (insert UC202D1, 35 mm OD) and has a unit mass of about 0.5 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." }, { "q": "What does the UCFL202 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 15 mm bore. UCFL202 is built from housing FL204 plus insert UC202D1 (D1 = greasable)." }, { "q": "How is UCFL202 locked to the shaft, and how tight should the setscrews be?", "a": "The UC202D1 insert uses two collar setscrews on the 15 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL202 instead of a pillow block?", "a": "Choose the UCFL202 two-bolt flange when the 15 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL203", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 17, "D_mm": 40, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 500, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL203", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL203" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL203 is the two-bolt rhombus flange option for a 17 mm shaft: insert UC203D1, housing FL204, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 17 mm shaft size; the unit is built from insert UC203D1 and housing FL204. For the frame-face drawing of UCFL203: the two holes are 90 mm apart (J), the rhombus spans 60 mm (L) and 113 mm (H), and M10 (12 mm) bolts clamp it around the 17 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Small-bore mounted units like this are chosen mostly to eliminate bearing-housing design work on OEM machines built in the tens of units rather than for duty-cycle reasons. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC203D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL203 weighs about 0.5 kg.", "applications": [ "appliance and HVAC OEM drives", "food-table and bottle-line rollers", "small fans and blowers", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The standard 2-series insert in UCFL203 is the lightest section at 17 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL203 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC203D1 insert of UCFL203 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCFL203 weighs little but its cast feet still crack on an uneven weldment; the 90 mm bolt centres must sit on a flat face, not bridge a weld bead." ], "faq": [ { "q": "What are the dimensions of an UCFL203 mounted bearing?", "a": "UCFL203 takes a 17 mm shaft (insert UC203D1, 40 mm OD) and has a unit mass of about 0.5 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." }, { "q": "What does the UCFL203 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 17 mm bore. UCFL203 is built from housing FL204 plus insert UC203D1 (D1 = greasable)." }, { "q": "How is UCFL203 locked to the shaft, and how tight should the setscrews be?", "a": "The UC203D1 insert uses two collar setscrews on the 17 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL203 instead of a pillow block?", "a": "Choose the UCFL203 two-bolt flange when the 17 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL204", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 20, "D_mm": 47, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 400, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL204", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL204" ], "naming_rule_text": "NTN delivers UCFL204 as a matched unit — the UC204D1 insert is locked into the FL204 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL204 means the FL204 housing carrying the UC204D1 insert, with the last two digits denoting the 20 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 113 mm flange height, L 60 mm across the ears, J 90 mm between the 12 mm holes, and a 20 mm shaft through the 47 mm OD UC204D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC204D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL204 weighs about 0.4 kg.", "applications": [ "food-table and bottle-line rollers", "small fans and blowers", "light agricultural augers", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL204 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFL204 with a bare UC204D1 bearing: replacing only the insert is possible, but the housing FL204 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCFL204, note the steel and cast-iron cover executions change the unit mass and envelope but not the 90 mm mounting centres.", "Small units like UCFL204 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 20 mm bore or the points strip out of the shaft.", "The standard 2-series insert in UCFL204 is the lightest section at 20 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not." ], "faq": [ { "q": "What does the UCFL204 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 20 mm bore. UCFL204 is built from housing FL204 plus insert UC204D1 (D1 = greasable)." }, { "q": "How is UCFL204 locked to the shaft, and how tight should the setscrews be?", "a": "The UC204D1 insert uses two collar setscrews on the 20 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL204 instead of a pillow block?", "a": "Choose the UCFL204 two-bolt flange when the 20 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL204 bearing self-aligning?", "a": "Yes within limits. The UC204D1 insert has a spherical outer diameter that pivots in the FL204 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL204 mounted bearing?", "a": "UCFL204 takes a 20 mm shaft (insert UC204D1, 47 mm OD) and has a unit mass of about 0.4 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL205", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 25, "D_mm": 52, "B_mm": 34.1, "seal_type": "2RS", "dynamic_load_kN": 15.5, "static_load_kN": 7.85, "fatigue_load_limit_kN": 0.55, "weight_g": 600, "housing_height_mm": 130, "base_length_mm": 68, "bolt_spacing_mm": 99, "bolt_size_mm": 16, "manufacturer_designation": "UCFL205", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL205" ], "naming_rule_text": "UCFL205 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC205D1 insert in a JIS B 1559 FL205 housing. On the nameplate, UCFL205 decodes as a UC wide-inner-ring insert in a FL diamond flange, 2-series duty, 25 mm bore; the UC205D1 designation shows the D1 greasable execution. Boundary data for the 25 mm bore: 130 mm high flange, 68 mm long over the rhombus, 99 mm hole centres for M14 fasteners through 16 mm holes; insert OD is 52 mm. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC205D1 insert are 15.5 kN dynamic and 7.85 kN static; the assembled UCFL205 weighs about 0.6 kg.", "applications": [ "textile line-shafting", "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "UCFL205 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 25 mm journal over time.", "In this bore band the temptation is to choose UCFL205 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The standard 2-series insert in UCFL205 is the lightest section at 25 mm — do not substitute it into a position that previously ran an X or 3 unit: the 99 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL205 pulls against the frame through only two M14 bolts on 99 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL205 locked to the shaft, and how tight should the setscrews be?", "a": "The UC205D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL205 instead of a pillow block?", "a": "Choose the UCFL205 two-bolt flange when the 25 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 99 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL205 mounted bearing?", "a": "UCFL205 takes a 25 mm shaft (insert UC205D1, 52 mm OD) and has a unit mass of about 0.6 kg. Flange figures: height H 130 mm, length L 68 mm, bolt centres J 99 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL205 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 25 mm bore. UCFL205 is built from housing FL205 plus insert UC205D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX05", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 25, "D_mm": 62, "B_mm": 38.1, "seal_type": "2RS", "dynamic_load_kN": 21.6, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.795, "weight_g": 1000, "housing_height_mm": 141, "base_length_mm": 83, "bolt_spacing_mm": 117, "bolt_size_mm": 12, "manufacturer_designation": "UCFLX05", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX05" ], "naming_rule_text": "NTN delivers UCFLX05 as a matched unit — the UCX05D1 insert is locked into the FLX05 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFLX05 means the FLX05 housing carrying the UCX05D1 insert, with the last two digits denoting the 25 mm bore in the X-series duty class. The mounting detail needs four numbers: H 141 mm flange height, L 83 mm across the ears, J 117 mm between the 12 mm holes, and a 25 mm shaft through the 62 mm OD UCX05D1 insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UCX05D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCFLX05 weighs about 1.0 kg.", "applications": [ "small crushers and screening feeds", "textile line-shafting", "machine-tool chip conveyors", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFLX05 pulls against the frame through only two M10 bolts on 117 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFLX05 with a bare UCX05D1 bearing: replacing only the insert is possible, but the housing FLX05 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCFLX05, note the steel and cast-iron cover executions change the unit mass and envelope but not the 117 mm mounting centres.", "With a 25 mm shaft the M10 foundation bolts of UCFLX05 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The X insert of UCFLX05 is wider and rated above the 2-series part at 25 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping." ], "faq": [ { "q": "What does the UCFLX05 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 25 mm bore. UCFLX05 is built from housing FLX05 plus insert UCX05D1 (D1 = greasable)." }, { "q": "How is UCFLX05 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX05D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX05 instead of a pillow block?", "a": "Choose the UCFLX05 two-bolt flange when the 25 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 117 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFLX05 bearing self-aligning?", "a": "Yes within limits. The UCX05D1 insert has a spherical outer diameter that pivots in the FLX05 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFLX05 mounted bearing?", "a": "UCFLX05 takes a 25 mm shaft (insert UCX05D1, 62 mm OD) and has a unit mass of about 1.0 kg. Flange figures: height H 141 mm, length L 83 mm, bolt centres J 117 mm, holes 12 mm for M10 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX05", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL305", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 25, "D_mm": 62, "B_mm": 38, "seal_type": "2RS", "dynamic_load_kN": 23.5, "static_load_kN": 10.9, "fatigue_load_limit_kN": 0.855, "weight_g": 900, "housing_height_mm": 150, "base_length_mm": 80, "bolt_spacing_mm": 113, "bolt_size_mm": 19, "manufacturer_designation": "UCFL305", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL305" ], "naming_rule_text": "For a 25 mm shaft ending at or passing through a vertical frame face, NTN UCFL305 is the diamond-flange answer: UC305D1 insert inside the FL305 cast-iron housing. The UCFL305 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 25 mm; FL305 and UC305D1 are the separate housing and insert part numbers inside. Shaft size is 25 mm; the 150 mm overall-height flange is 80 mm long across the rhombus (L), with its two mounting holes on 113 mm centres (J) clearing 19 mm M16 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Textile and fibre-processing machines use these units on long line-shafting; several bearings share one shaft, and the self-aligning feature prevents one poor bracket from loading its neighbours. A film of anti-seize on the spherical surfaces at assembly prevents fretting corrosion welding insert to housing — the failure mode that turns a five-minute insert swap into a housing replacement. Basic ratings of the UC305D1 insert are 23.5 kN dynamic and 10.9 kN static; the assembled UCFL305 weighs about 0.9 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Never weld a bracket to the FL305 housing of UCFL305: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "With a 25 mm shaft the M16 foundation bolts of UCFL305 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The 3-series insert makes UCFL305 the highest-rated unit at 25 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL305 pulls against the frame through only two M16 bolts on 113 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL305 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL305 instead of a pillow block?", "a": "Choose the UCFL305 two-bolt flange when the 25 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 113 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL305 unit carry?", "a": "The UC305D1 insert is rated at 23.5 kN dynamic and 10.9 kN basic static (fatigue load limit 0.855 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL305 mounted bearing?", "a": "UCFL305 takes a 25 mm shaft (insert UC305D1, 62 mm OD) and has a unit mass of about 0.9 kg. Flange figures: height H 150 mm, length L 80 mm, bolt centres J 113 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL305 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 25 mm bore. UCFL305 is built from housing FL305 plus insert UC305D1 (D1 = greasable)." }, { "q": "How is UCFL305 locked to the shaft, and how tight should the setscrews be?", "a": "The UC305D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL206", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 30, "D_mm": 62, "B_mm": 38.1, "seal_type": "2RS", "dynamic_load_kN": 21.6, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.795, "weight_g": 800, "housing_height_mm": 148, "base_length_mm": 80, "bolt_spacing_mm": 117, "bolt_size_mm": 16, "manufacturer_designation": "UCFL206", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL206" ], "naming_rule_text": "For a 30 mm shaft ending at or passing through a vertical frame face, NTN UCFL206 is the diamond-flange answer: UC206D1 insert inside the FL206 cast-iron housing. The UCFL206 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 30 mm; FL206 and UC206D1 are the separate housing and insert part numbers inside. Shaft size is 30 mm; the 148 mm overall-height flange is 80 mm long across the rhombus (L), with its two mounting holes on 117 mm centres (J) clearing 16 mm M14 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC206D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCFL206 weighs about 0.8 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Never weld a bracket to the FL206 housing of UCFL206: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFL206 can look adequate at 30 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The standard 2-series insert in UCFL206 is the lightest section at 30 mm — do not substitute it into a position that previously ran an X or 3 unit: the 117 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL206 pulls against the frame through only two M14 bolts on 117 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL206 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL206 instead of a pillow block?", "a": "Choose the UCFL206 two-bolt flange when the 30 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 117 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL206 unit carry?", "a": "The UC206D1 insert is rated at 21.6 kN dynamic and 11.3 kN basic static (fatigue load limit 0.795 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL206 mounted bearing?", "a": "UCFL206 takes a 30 mm shaft (insert UC206D1, 62 mm OD) and has a unit mass of about 0.8 kg. Flange figures: height H 148 mm, length L 80 mm, bolt centres J 117 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL206 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 30 mm bore. UCFL206 is built from housing FL206 plus insert UC206D1 (D1 = greasable)." }, { "q": "How is UCFL206 locked to the shaft, and how tight should the setscrews be?", "a": "The UC206D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX06", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 30, "D_mm": 72, "B_mm": 42.9, "seal_type": "2RS", "dynamic_load_kN": 28.4, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.09, "weight_g": 1400, "housing_height_mm": 156, "base_length_mm": 95, "bolt_spacing_mm": 130, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX06", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX06" ], "naming_rule_text": "UCFLX06 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UCX06D1 insert in a JIS B 1559 FLX06 housing. On the nameplate, UCFLX06 decodes as a UC wide-inner-ring insert in a FL diamond flange, X-series duty, 30 mm bore; the UCX06D1 designation shows the D1 greasable execution. Boundary data for the 30 mm bore: 156 mm high flange, 95 mm long over the rhombus, 130 mm hole centres for M14 fasteners through 16 mm holes; insert OD is 72 mm. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UCX06D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCFLX06 weighs about 1.4 kg.", "applications": [ "textile line-shafting", "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "UCFLX06 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 30 mm journal over time.", "In this bore band the temptation is to choose UCFLX06 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The X insert of UCFLX06 is wider and rated above the 2-series part at 30 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX06 pulls against the frame through only two M14 bolts on 130 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFLX06 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX06D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX06 instead of a pillow block?", "a": "Choose the UCFLX06 two-bolt flange when the 30 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 130 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFLX06 mounted bearing?", "a": "UCFLX06 takes a 30 mm shaft (insert UCX06D1, 72 mm OD) and has a unit mass of about 1.4 kg. Flange figures: height H 156 mm, length L 95 mm, bolt centres J 130 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX06 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 30 mm bore. UCFLX06 is built from housing FLX06 plus insert UCX06D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX06", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL306", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 30, "D_mm": 72, "B_mm": 43, "seal_type": "2RS", "dynamic_load_kN": 29.5, "static_load_kN": 15, "fatigue_load_limit_kN": 1.14, "weight_g": 1400, "housing_height_mm": 180, "base_length_mm": 90, "bolt_spacing_mm": 134, "bolt_size_mm": 23, "manufacturer_designation": "UCFL306", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL306" ], "naming_rule_text": "UCFL306 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC306D1 ball bearing insert pre-assembled in a FL306 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 30 mm bore. Key mounting figures: flange height H = 180 mm, overall length L = 90 mm across the diamond, bolt centres J = 134 mm, and each ear takes a 23 mm (M20) fastener for the 30 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. On industrial centrifugal fans this size is standard at both shaft ends; fan loads are light but belt tension is not, and the cast housing dissipates the heat conducted out of the insert. Shim under the feet, never file the sole: full-area shim packs on both sides keep the bolt clamp load spread across the base, while a single thin shim pivots the housing and preloads the bearing. Basic ratings of the UC306D1 insert are 29.5 kN dynamic and 15 kN static; the assembled UCFL306 weighs about 1.4 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The 3-series insert makes UCFL306 the highest-rated unit at 30 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL306 pulls against the frame through only two M20 bolts on 134 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL306, note the steel and cast-iron cover executions change the unit mass and envelope but not the 134 mm mounting centres.", "In this bore band the temptation is to choose UCFL306 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCFL306 mounted bearing?", "a": "UCFL306 takes a 30 mm shaft (insert UC306D1, 72 mm OD) and has a unit mass of about 1.4 kg. Flange figures: height H 180 mm, length L 90 mm, bolt centres J 134 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL306 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 30 mm bore. UCFL306 is built from housing FL306 plus insert UC306D1 (D1 = greasable)." }, { "q": "How is UCFL306 locked to the shaft, and how tight should the setscrews be?", "a": "The UC306D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL306 instead of a pillow block?", "a": "Choose the UCFL306 two-bolt flange when the 30 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 134 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL207", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 35, "D_mm": 72, "B_mm": 42.9, "seal_type": "2RS", "dynamic_load_kN": 28.4, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.09, "weight_g": 1200, "housing_height_mm": 161, "base_length_mm": 90, "bolt_spacing_mm": 130, "bolt_size_mm": 16, "manufacturer_designation": "UCFL207", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL207" ], "naming_rule_text": "UCFL207 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC207D1 ball bearing insert pre-assembled in a FL207 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 35 mm bore. Key mounting figures: flange height H = 161 mm, overall length L = 90 mm across the diamond, bolt centres J = 130 mm, and each ear takes a 16 mm (M14) fastener for the 35 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC207D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCFL207 weighs about 1.2 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The standard 2-series insert in UCFL207 is the lightest section at 35 mm — do not substitute it into a position that previously ran an X or 3 unit: the 130 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL207 pulls against the frame through only two M14 bolts on 130 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL207, note the steel and cast-iron cover executions change the unit mass and envelope but not the 130 mm mounting centres.", "With a 35 mm shaft the M14 foundation bolts of UCFL207 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCFL207 mounted bearing?", "a": "UCFL207 takes a 35 mm shaft (insert UC207D1, 72 mm OD) and has a unit mass of about 1.2 kg. Flange figures: height H 161 mm, length L 90 mm, bolt centres J 130 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL207 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 35 mm bore. UCFL207 is built from housing FL207 plus insert UC207D1 (D1 = greasable)." }, { "q": "How is UCFL207 locked to the shaft, and how tight should the setscrews be?", "a": "The UC207D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL207 instead of a pillow block?", "a": "Choose the UCFL207 two-bolt flange when the 35 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 130 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX07", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 35, "D_mm": 80, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "weight_g": 1800, "housing_height_mm": 171, "base_length_mm": 105, "bolt_spacing_mm": 144, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX07", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX07" ], "naming_rule_text": "For a 35 mm shaft ending at or passing through a vertical frame face, NTN UCFLX07 is the diamond-flange answer: UCX07D1 insert inside the FLX07 cast-iron housing. The UCFLX07 number follows NTN's mounted-unit convention: housing letter FL, X-series section, bore code for 35 mm; FLX07 and UCX07D1 are the separate housing and insert part numbers inside. Shaft size is 35 mm; the 171 mm overall-height flange is 105 mm long across the rhombus (L), with its two mounting holes on 144 mm centres (J) clearing 16 mm M14 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UCX07D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCFLX07 weighs about 1.8 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Never weld a bracket to the FLX07 housing of UCFLX07: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFLX07 can look adequate at 35 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The X insert of UCFLX07 is wider and rated above the 2-series part at 35 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX07 pulls against the frame through only two M14 bolts on 144 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFLX07 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFLX07 instead of a pillow block?", "a": "Choose the UCFLX07 two-bolt flange when the 35 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 144 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFLX07 unit carry?", "a": "The UCX07D1 insert is rated at 32.5 kN dynamic and 17.8 kN basic static (fatigue load limit 1.24 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFLX07 mounted bearing?", "a": "UCFLX07 takes a 35 mm shaft (insert UCX07D1, 80 mm OD) and has a unit mass of about 1.8 kg. Flange figures: height H 171 mm, length L 105 mm, bolt centres J 144 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX07 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 35 mm bore. UCFLX07 is built from housing FLX07 plus insert UCX07D1 (D1 = greasable)." }, { "q": "How is UCFLX07 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX07D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX07", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL307", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 35, "D_mm": 80, "B_mm": 48, "seal_type": "2RS", "dynamic_load_kN": 37, "static_load_kN": 19.1, "fatigue_load_limit_kN": 1.47, "weight_g": 1700, "housing_height_mm": 185, "base_length_mm": 100, "bolt_spacing_mm": 141, "bolt_size_mm": 23, "manufacturer_designation": "UCFL307", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL307" ], "naming_rule_text": "The NTN UCFL307 flanged unit combines a sealed UC307D1 insert with a diamond-shaped FL307 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 35 mm shaft size; the unit is built from insert UC307D1 and housing FL307. For the frame-face drawing of UCFL307: the two holes are 141 mm apart (J), the rhombus spans 100 mm (L) and 185 mm (H), and M20 (23 mm) bolts clamp it around the 35 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC307D1 insert are 37 kN dynamic and 19.1 kN static; the assembled UCFL307 weighs about 1.7 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCFL307 the highest-rated unit at 35 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL307 pulls against the frame through only two M20 bolts on 141 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC307D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL307 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC307D1 insert of UCFL307 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "The standard section of UCFL307 can look adequate at 35 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide." ], "faq": [ { "q": "What are the dimensions of an UCFL307 mounted bearing?", "a": "UCFL307 takes a 35 mm shaft (insert UC307D1, 80 mm OD) and has a unit mass of about 1.7 kg. Flange figures: height H 185 mm, length L 100 mm, bolt centres J 141 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL307 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 35 mm bore. UCFL307 is built from housing FL307 plus insert UC307D1 (D1 = greasable)." }, { "q": "How is UCFL307 locked to the shaft, and how tight should the setscrews be?", "a": "The UC307D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL307 instead of a pillow block?", "a": "Choose the UCFL307 two-bolt flange when the 35 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 141 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL307 unit?", "a": "There is no single interval for UCFL307: the UC307D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL208", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 40, "D_mm": 80, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "weight_g": 1500, "housing_height_mm": 175, "base_length_mm": 100, "bolt_spacing_mm": 144, "bolt_size_mm": 16, "manufacturer_designation": "UCFL208", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL208" ], "naming_rule_text": "The NTN UCFL208 flanged unit combines a sealed UC208D1 insert with a diamond-shaped FL208 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 40 mm shaft size; the unit is built from insert UC208D1 and housing FL208. For the frame-face drawing of UCFL208: the two holes are 144 mm apart (J), the rhombus spans 100 mm (L) and 175 mm (H), and M14 (16 mm) bolts clamp it around the 40 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC208D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCFL208 weighs about 1.5 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The standard 2-series insert in UCFL208 is the lightest section at 40 mm — do not substitute it into a position that previously ran an X or 3 unit: the 144 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL208 pulls against the frame through only two M14 bolts on 144 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC208D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL208 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC208D1 insert of UCFL208 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "In this bore band the temptation is to choose UCFL208 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCFL208 mounted bearing?", "a": "UCFL208 takes a 40 mm shaft (insert UC208D1, 80 mm OD) and has a unit mass of about 1.5 kg. Flange figures: height H 175 mm, length L 100 mm, bolt centres J 144 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL208 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 40 mm bore. UCFL208 is built from housing FL208 plus insert UC208D1 (D1 = greasable)." }, { "q": "How is UCFL208 locked to the shaft, and how tight should the setscrews be?", "a": "The UC208D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL208 instead of a pillow block?", "a": "Choose the UCFL208 two-bolt flange when the 40 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 144 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL208 unit?", "a": "There is no single interval for UCFL208: the UC208D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX08", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 40, "D_mm": 90, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "weight_g": 2000, "housing_height_mm": 179, "base_length_mm": 111, "bolt_spacing_mm": 148, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX08", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX08" ], "naming_rule_text": "UCFLX08 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UCX08D1 ball bearing insert pre-assembled in a FLX08 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the X code identifies the duty series and the final two digits encode the 40 mm bore. Key mounting figures: flange height H = 179 mm, overall length L = 111 mm across the diamond, bolt centres J = 148 mm, and each ear takes a 16 mm (M14) fastener for the 40 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UCX08D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCFLX08 weighs about 2.0 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The X insert of UCFLX08 is wider and rated above the 2-series part at 40 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX08 pulls against the frame through only two M14 bolts on 148 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFLX08, note the steel and cast-iron cover executions change the unit mass and envelope but not the 148 mm mounting centres.", "With a 40 mm shaft the M14 foundation bolts of UCFLX08 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCFLX08 mounted bearing?", "a": "UCFLX08 takes a 40 mm shaft (insert UCX08D1, 90 mm OD) and has a unit mass of about 2.0 kg. Flange figures: height H 179 mm, length L 111 mm, bolt centres J 148 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX08 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 40 mm bore. UCFLX08 is built from housing FLX08 plus insert UCX08D1 (D1 = greasable)." }, { "q": "How is UCFLX08 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX08D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX08 instead of a pillow block?", "a": "Choose the UCFLX08 two-bolt flange when the 40 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 148 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX08", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL308", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 40, "D_mm": 90, "B_mm": 52, "seal_type": "2RS", "dynamic_load_kN": 45, "static_load_kN": 24, "fatigue_load_limit_kN": 1.83, "weight_g": 2200, "housing_height_mm": 200, "base_length_mm": 112, "bolt_spacing_mm": 158, "bolt_size_mm": 23, "manufacturer_designation": "UCFL308", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL308" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL308 is the two-bolt rhombus flange option for a 40 mm shaft: insert UC308D1, housing FL308, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL308 means the FL308 housing carrying the UC308D1 insert, with the last two digits denoting the 40 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 200 mm flange height, L 112 mm across the ears, J 158 mm between the 23 mm holes, and a 40 mm shaft through the 90 mm OD UC308D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC308D1 insert are 45 kN dynamic and 24 kN static; the assembled UCFL308 weighs about 2.2 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "Never weld a bracket to the FL308 housing of UCFL308: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "With a 40 mm shaft the M20 foundation bolts of UCFL308 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The 3-series insert makes UCFL308 the highest-rated unit at 40 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL308 pulls against the frame through only two M20 bolts on 158 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL308 locked to the shaft, and how tight should the setscrews be?", "a": "The UC308D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL308 instead of a pillow block?", "a": "Choose the UCFL308 two-bolt flange when the 40 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 158 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL308 mounted bearing?", "a": "UCFL308 takes a 40 mm shaft (insert UC308D1, 90 mm OD) and has a unit mass of about 2.2 kg. Flange figures: height H 200 mm, length L 112 mm, bolt centres J 158 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL308 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 40 mm bore. UCFL308 is built from housing FL308 plus insert UC308D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL209", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 45, "D_mm": 85, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "weight_g": 1800, "housing_height_mm": 188, "base_length_mm": 108, "bolt_spacing_mm": 148, "bolt_size_mm": 19, "manufacturer_designation": "UCFL209", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL209" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL209 is the two-bolt rhombus flange option for a 45 mm shaft: insert UC209D1, housing FL209, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL209 means the FL209 housing carrying the UC209D1 insert, with the last two digits denoting the 45 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 188 mm flange height, L 108 mm across the ears, J 148 mm between the 19 mm holes, and a 45 mm shaft through the 85 mm OD UC209D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC209D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCFL209 weighs about 1.8 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "Never weld a bracket to the FL209 housing of UCFL209: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFL209 can look adequate at 45 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The standard 2-series insert in UCFL209 is the lightest section at 45 mm — do not substitute it into a position that previously ran an X or 3 unit: the 148 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL209 pulls against the frame through only two M16 bolts on 148 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL209 locked to the shaft, and how tight should the setscrews be?", "a": "The UC209D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL209 instead of a pillow block?", "a": "Choose the UCFL209 two-bolt flange when the 45 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 148 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL209 mounted bearing?", "a": "UCFL209 takes a 45 mm shaft (insert UC209D1, 85 mm OD) and has a unit mass of about 1.8 kg. Flange figures: height H 188 mm, length L 108 mm, bolt centres J 148 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL209 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 45 mm bore. UCFL209 is built from housing FL209 plus insert UC209D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX09", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 45, "D_mm": 100, "B_mm": 51.6, "seal_type": "2RS", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "weight_g": 2200, "housing_height_mm": 189, "base_length_mm": 116, "bolt_spacing_mm": 157, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX09", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX09" ], "naming_rule_text": "The NTN UCFLX09 flanged unit combines a sealed UCX09D1 insert with a diamond-shaped FLX09 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series X, bore code ending in the 45 mm shaft size; the unit is built from insert UCX09D1 and housing FLX09. For the frame-face drawing of UCFLX09: the two holes are 157 mm apart (J), the rhombus spans 116 mm (L) and 189 mm (H), and M14 (16 mm) bolts clamp it around the 45 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UCX09D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCFLX09 weighs about 2.2 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The X insert of UCFLX09 is wider and rated above the 2-series part at 45 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX09 pulls against the frame through only two M14 bolts on 157 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UCX09D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFLX09 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UCX09D1 insert of UCFLX09 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "In this bore band the temptation is to choose UCFLX09 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCFLX09 mounted bearing?", "a": "UCFLX09 takes a 45 mm shaft (insert UCX09D1, 100 mm OD) and has a unit mass of about 2.2 kg. Flange figures: height H 189 mm, length L 116 mm, bolt centres J 157 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX09 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 45 mm bore. UCFLX09 is built from housing FLX09 plus insert UCX09D1 (D1 = greasable)." }, { "q": "How is UCFLX09 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX09D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX09 instead of a pillow block?", "a": "Choose the UCFLX09 two-bolt flange when the 45 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 157 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFLX09 unit?", "a": "There is no single interval for UCFLX09: the UCX09D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX09", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL309", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 45, "D_mm": 100, "B_mm": 57, "seal_type": "2RS", "dynamic_load_kN": 58.5, "static_load_kN": 32, "fatigue_load_limit_kN": 2.5, "weight_g": 3000, "housing_height_mm": 230, "base_length_mm": 125, "bolt_spacing_mm": 177, "bolt_size_mm": 25, "manufacturer_designation": "UCFL309", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL309" ], "naming_rule_text": "NTN delivers UCFL309 as a matched unit — the UC309D1 insert is locked into the FL309 rhombus cast-iron flange at the factory and arrives greased and sealed. On the nameplate, UCFL309 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 45 mm bore; the UC309D1 designation shows the D1 greasable execution. Boundary data for the 45 mm bore: 230 mm high flange, 125 mm long over the rhombus, 177 mm hole centres for M22 fasteners through 25 mm holes; insert OD is 100 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC309D1 insert are 58.5 kN dynamic and 32 kN static; the assembled UCFL309 weighs about 3.0 kg.", "applications": [ "small crushers and screening feeds", "textile line-shafting", "machine-tool chip conveyors", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "At replacement time, measure the 45 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL309 creep identically to the old one.", "UCFL309 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 45 mm journal over time.", "In this bore band the temptation is to choose UCFL309 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The 3-series insert makes UCFL309 the highest-rated unit at 45 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL309 pulls against the frame through only two M22 bolts on 177 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL309 locked to the shaft, and how tight should the setscrews be?", "a": "The UC309D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL309 instead of a pillow block?", "a": "Choose the UCFL309 two-bolt flange when the 45 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 177 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Can I replace just the insert inside an UCFL309 unit?", "a": "Yes — UCFL309 is an assembly of the FL309 housing and UC309D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 45 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCFL309 mounted bearing?", "a": "UCFL309 takes a 45 mm shaft (insert UC309D1, 100 mm OD) and has a unit mass of about 3.0 kg. Flange figures: height H 230 mm, length L 125 mm, bolt centres J 177 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL309 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 45 mm bore. UCFL309 is built from housing FL309 plus insert UC309D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL210", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 50, "D_mm": 90, "B_mm": 51.6, "seal_type": "2RS", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "weight_g": 2000, "housing_height_mm": 197, "base_length_mm": 115, "bolt_spacing_mm": 157, "bolt_size_mm": 19, "manufacturer_designation": "UCFL210", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL210" ], "naming_rule_text": "UCFL210 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC210D1 ball bearing insert pre-assembled in a FL210 cast-iron flange housing. The UCFL210 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 50 mm; FL210 and UC210D1 are the separate housing and insert part numbers inside. Shaft size is 50 mm; the 197 mm overall-height flange is 115 mm long across the rhombus (L), with its two mounting holes on 157 mm centres (J) clearing 19 mm M16 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC210D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCFL210 weighs about 2.0 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "The standard 2-series insert in UCFL210 is the lightest section at 50 mm — do not substitute it into a position that previously ran an X or 3 unit: the 157 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL210 pulls against the frame through only two M16 bolts on 157 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL210, note the steel and cast-iron cover executions change the unit mass and envelope but not the 157 mm mounting centres.", "With a 50 mm shaft the M16 foundation bolts of UCFL210 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCFL210 mounted bearing?", "a": "UCFL210 takes a 50 mm shaft (insert UC210D1, 90 mm OD) and has a unit mass of about 2.0 kg. Flange figures: height H 197 mm, length L 115 mm, bolt centres J 157 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL210 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 50 mm bore. UCFL210 is built from housing FL210 plus insert UC210D1 (D1 = greasable)." }, { "q": "How is UCFL210 locked to the shaft, and how tight should the setscrews be?", "a": "The UC210D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL210 instead of a pillow block?", "a": "Choose the UCFL210 two-bolt flange when the 50 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 157 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX10", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 50, "D_mm": 110, "B_mm": 55.6, "seal_type": "2RS", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "weight_g": 3000, "housing_height_mm": 216, "base_length_mm": 133, "bolt_spacing_mm": 184, "bolt_size_mm": 19, "manufacturer_designation": "UCFLX10", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX10" ], "naming_rule_text": "For a 50 mm shaft ending at or passing through a vertical frame face, NTN UCFLX10 is the diamond-flange answer: UCX10D1 insert inside the FLX10 cast-iron housing. On the nameplate, UCFLX10 decodes as a UC wide-inner-ring insert in a FL diamond flange, X-series duty, 50 mm bore; the UCX10D1 designation shows the D1 greasable execution. Boundary data for the 50 mm bore: 216 mm high flange, 133 mm long over the rhombus, 184 mm hole centres for M16 fasteners through 19 mm holes; insert OD is 110 mm. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UCX10D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCFLX10 weighs about 3.0 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "The lip seals and slingers on UCFLX10 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the FLX10 housing of UCFLX10: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFLX10 can look adequate at 50 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The X insert of UCFLX10 is wider and rated above the 2-series part at 50 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX10 pulls against the frame through only two M16 bolts on 184 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFLX10 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX10D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX10 instead of a pillow block?", "a": "Choose the UCFLX10 two-bolt flange when the 50 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 184 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Can I replace just the insert inside an UCFLX10 unit?", "a": "Yes — UCFLX10 is an assembly of the FLX10 housing and UCX10D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 50 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCFLX10 mounted bearing?", "a": "UCFLX10 takes a 50 mm shaft (insert UCX10D1, 110 mm OD) and has a unit mass of about 3.0 kg. Flange figures: height H 216 mm, length L 133 mm, bolt centres J 184 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFLX10 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 50 mm bore. UCFLX10 is built from housing FLX10 plus insert UCX10D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX10", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL310", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 50, "D_mm": 110, "B_mm": 61, "seal_type": "2RS", "dynamic_load_kN": 68.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.99, "weight_g": 4100, "housing_height_mm": 240, "base_length_mm": 140, "bolt_spacing_mm": 187, "bolt_size_mm": 25, "manufacturer_designation": "UCFL310", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL310" ], "naming_rule_text": "The NTN UCFL310 flanged unit combines a sealed UC310D1 insert with a diamond-shaped FL310 cast-iron housing that bolts flat against a machine frame. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 50 mm bore. Key mounting figures: flange height H = 240 mm, overall length L = 140 mm across the diamond, bolt centres J = 187 mm, and each ear takes a 25 mm (M22) fastener for the 50 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC310D1 insert are 68.5 kN dynamic and 38.5 kN static; the assembled UCFL310 weighs about 4.1 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "The standard section of UCFL310 can look adequate at 50 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The 3-series insert makes UCFL310 the highest-rated unit at 50 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL310 pulls against the frame through only two M22 bolts on 187 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC310D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL310 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC310D1 insert of UCFL310 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat." ], "faq": [ { "q": "Does UCFL310 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 187 mm bolt centres of UCFL310 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCFL310 mounted bearing?", "a": "UCFL310 takes a 50 mm shaft (insert UC310D1, 110 mm OD) and has a unit mass of about 4.1 kg. Flange figures: height H 240 mm, length L 140 mm, bolt centres J 187 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL310 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 50 mm bore. UCFL310 is built from housing FL310 plus insert UC310D1 (D1 = greasable)." }, { "q": "How is UCFL310 locked to the shaft, and how tight should the setscrews be?", "a": "The UC310D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL310 instead of a pillow block?", "a": "Choose the UCFL310 two-bolt flange when the 50 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 187 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL211", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 55, "D_mm": 100, "B_mm": 55.6, "seal_type": "2RS", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "weight_g": 2900, "housing_height_mm": 224, "base_length_mm": 130, "bolt_spacing_mm": 184, "bolt_size_mm": 19, "manufacturer_designation": "UCFL211", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL211" ], "naming_rule_text": "The NTN UCFL211 flanged unit combines a sealed UC211D1 insert with a diamond-shaped FL211 cast-iron housing that bolts flat against a machine frame. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 55 mm bore. Key mounting figures: flange height H = 224 mm, overall length L = 130 mm across the diamond, bolt centres J = 184 mm, and each ear takes a 19 mm (M16) fastener for the 55 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC211D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCFL211 weighs about 2.9 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "At 55 mm bore the 130 mm base of UCFL211 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The standard 2-series insert in UCFL211 is the lightest section at 55 mm — do not substitute it into a position that previously ran an X or 3 unit: the 184 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL211 pulls against the frame through only two M16 bolts on 184 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC211D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL211 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC211D1 insert of UCFL211 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat." ], "faq": [ { "q": "Does UCFL211 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 184 mm bolt centres of UCFL211 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCFL211 mounted bearing?", "a": "UCFL211 takes a 55 mm shaft (insert UC211D1, 100 mm OD) and has a unit mass of about 2.9 kg. Flange figures: height H 224 mm, length L 130 mm, bolt centres J 184 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL211 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 55 mm bore. UCFL211 is built from housing FL211 plus insert UC211D1 (D1 = greasable)." }, { "q": "How is UCFL211 locked to the shaft, and how tight should the setscrews be?", "a": "The UC211D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL211 instead of a pillow block?", "a": "Choose the UCFL211 two-bolt flange when the 55 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 184 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL311", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 55, "D_mm": 120, "B_mm": 66, "seal_type": "2RS", "dynamic_load_kN": 79.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "weight_g": 4600, "housing_height_mm": 250, "base_length_mm": 150, "bolt_spacing_mm": 198, "bolt_size_mm": 25, "manufacturer_designation": "UCFL311", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL311" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL311 is the two-bolt rhombus flange option for a 55 mm shaft: insert UC311D1, housing FL311, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 55 mm shaft size; the unit is built from insert UC311D1 and housing FL311. For the frame-face drawing of UCFL311: the two holes are 198 mm apart (J), the rhombus spans 150 mm (L) and 250 mm (H), and M22 (25 mm) bolts clamp it around the 55 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC311D1 insert are 79.5 kN dynamic and 45 kN static; the assembled UCFL311 weighs about 4.6 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "Never weld a bracket to the FL311 housing of UCFL311: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Heavy drives on UCFL311 should have the setscrews re-torqued after the first day; at 55 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The 3-series insert makes UCFL311 the highest-rated unit at 55 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL311 pulls against the frame through only two M22 bolts on 198 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL311 locked to the shaft, and how tight should the setscrews be?", "a": "The UC311D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL311 instead of a pillow block?", "a": "Choose the UCFL311 two-bolt flange when the 55 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 198 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL311 mounted bearing?", "a": "UCFL311 takes a 55 mm shaft (insert UC311D1, 120 mm OD) and has a unit mass of about 4.6 kg. Flange figures: height H 250 mm, length L 150 mm, bolt centres J 198 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL311 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 55 mm bore. UCFL311 is built from housing FL311 plus insert UC311D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL212", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 60, "D_mm": 110, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "weight_g": 3800, "housing_height_mm": 250, "base_length_mm": 140, "bolt_spacing_mm": 202, "bolt_size_mm": 23, "manufacturer_designation": "UCFL212", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL212" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL212 is the two-bolt rhombus flange option for a 60 mm shaft: insert UC212D1, housing FL212, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 60 mm shaft size; the unit is built from insert UC212D1 and housing FL212. For the frame-face drawing of UCFL212: the two holes are 202 mm apart (J), the rhombus spans 140 mm (L) and 250 mm (H), and M20 (23 mm) bolts clamp it around the 60 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC212D1 insert are 58 kN dynamic and 36 kN static; the assembled UCFL212 weighs about 3.8 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "Never weld a bracket to the FL212 housing of UCFL212: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "UCFL212 at 60 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 250 mm centre height and binds the insert.", "The standard 2-series insert in UCFL212 is the lightest section at 60 mm — do not substitute it into a position that previously ran an X or 3 unit: the 202 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL212 pulls against the frame through only two M20 bolts on 202 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL212 locked to the shaft, and how tight should the setscrews be?", "a": "The UC212D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL212 instead of a pillow block?", "a": "Choose the UCFL212 two-bolt flange when the 60 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 202 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL212 mounted bearing?", "a": "UCFL212 takes a 60 mm shaft (insert UC212D1, 110 mm OD) and has a unit mass of about 3.8 kg. Flange figures: height H 250 mm, length L 140 mm, bolt centres J 202 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL212 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 60 mm bore. UCFL212 is built from housing FL212 plus insert UC212D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL312", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 60, "D_mm": 130, "B_mm": 71, "seal_type": "2RS", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "weight_g": 5700, "housing_height_mm": 270, "base_length_mm": 160, "bolt_spacing_mm": 212, "bolt_size_mm": 31, "manufacturer_designation": "UCFL312", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL312" ], "naming_rule_text": "NTN delivers UCFL312 as a matched unit — the UC312D1 insert is locked into the FL312 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL312 means the FL312 housing carrying the UC312D1 insert, with the last two digits denoting the 60 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 270 mm flange height, L 160 mm across the ears, J 212 mm between the 31 mm holes, and a 60 mm shaft through the 130 mm OD UC312D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC312D1 insert are 90.5 kN dynamic and 52 kN static; the assembled UCFL312 weighs about 5.7 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL312 pulls against the frame through only two M27 bolts on 212 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "At replacement time, measure the 60 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL312 creep identically to the old one.", "UCFL312 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 60 mm journal over time.", "At 60 mm bore the 160 mm base of UCFL312 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCFL312 the highest-rated unit at 60 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCFL312 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 60 mm bore. UCFL312 is built from housing FL312 plus insert UC312D1 (D1 = greasable)." }, { "q": "How is UCFL312 locked to the shaft, and how tight should the setscrews be?", "a": "The UC312D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL312 instead of a pillow block?", "a": "Choose the UCFL312 two-bolt flange when the 60 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M27 bolts on 212 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL312 bearing self-aligning?", "a": "Yes within limits. The UC312D1 insert has a spherical outer diameter that pivots in the FL312 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL312 mounted bearing?", "a": "UCFL312 takes a 60 mm shaft (insert UC312D1, 130 mm OD) and has a unit mass of about 5.7 kg. Flange figures: height H 270 mm, length L 160 mm, bolt centres J 212 mm, holes 31 mm for M27 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL213", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 65, "D_mm": 120, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "weight_g": 4800, "housing_height_mm": 258, "base_length_mm": 155, "bolt_spacing_mm": 210, "bolt_size_mm": 23, "manufacturer_designation": "UCFL213", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL213" ], "naming_rule_text": "NTN delivers UCFL213 as a matched unit — the UC213D1 insert is locked into the FL213 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL213 means the FL213 housing carrying the UC213D1 insert, with the last two digits denoting the 65 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 258 mm flange height, L 155 mm across the ears, J 210 mm between the 23 mm holes, and a 65 mm shaft through the 120 mm OD UC213D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC213D1 insert are 63.5 kN dynamic and 40 kN static; the assembled UCFL213 weighs about 4.8 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL213 pulls against the frame through only two M20 bolts on 210 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "At replacement time, measure the 65 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL213 creep identically to the old one.", "UCFL213 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 65 mm journal over time.", "Heavy drives on UCFL213 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The standard 2-series insert in UCFL213 is the lightest section at 65 mm — do not substitute it into a position that previously ran an X or 3 unit: the 210 mm mounting may match while the load rating does not." ], "faq": [ { "q": "What does the UCFL213 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 65 mm bore. UCFL213 is built from housing FL213 plus insert UC213D1 (D1 = greasable)." }, { "q": "How is UCFL213 locked to the shaft, and how tight should the setscrews be?", "a": "The UC213D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL213 instead of a pillow block?", "a": "Choose the UCFL213 two-bolt flange when the 65 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 210 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL213 bearing self-aligning?", "a": "Yes within limits. The UC213D1 insert has a spherical outer diameter that pivots in the FL213 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL213 mounted bearing?", "a": "UCFL213 takes a 65 mm shaft (insert UC213D1, 120 mm OD) and has a unit mass of about 4.8 kg. Flange figures: height H 258 mm, length L 155 mm, bolt centres J 210 mm, holes 23 mm for M20 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL213", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL313", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 65, "D_mm": 140, "B_mm": 75, "seal_type": "2RS", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "weight_g": 7500, "housing_height_mm": 295, "base_length_mm": 175, "bolt_spacing_mm": 240, "bolt_size_mm": 31, "manufacturer_designation": "UCFL313", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL313" ], "naming_rule_text": "UCFL313 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC313D1 insert in a JIS B 1559 FL313 housing. On the nameplate, UCFL313 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 65 mm bore; the UC313D1 designation shows the D1 greasable execution. Boundary data for the 65 mm bore: 295 mm high flange, 175 mm long over the rhombus, 240 mm hole centres for M27 fasteners through 31 mm holes; insert OD is 140 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC313D1 insert are 103 kN dynamic and 60 kN static; the assembled UCFL313 weighs about 7.5 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "The 3-series insert makes UCFL313 the highest-rated unit at 65 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL313 pulls against the frame through only two M27 bolts on 240 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC313D1 insert of UCFL313 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCFL313 at 65 mm uses M27 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 295 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCFL313 mounted bearing?", "a": "UCFL313 takes a 65 mm shaft (insert UC313D1, 140 mm OD) and has a unit mass of about 7.5 kg. Flange figures: height H 295 mm, length L 175 mm, bolt centres J 240 mm, holes 31 mm for M27 bolts." }, { "q": "What does the UCFL313 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 65 mm bore. UCFL313 is built from housing FL313 plus insert UC313D1 (D1 = greasable)." }, { "q": "How is UCFL313 locked to the shaft, and how tight should the setscrews be?", "a": "The UC313D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL313 instead of a pillow block?", "a": "Choose the UCFL313 two-bolt flange when the 65 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M27 bolts on 240 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL214", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 70, "D_mm": 125, "B_mm": 74.6, "seal_type": "2RS", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "weight_g": 5400, "housing_height_mm": 265, "base_length_mm": 160, "bolt_spacing_mm": 216, "bolt_size_mm": 23, "manufacturer_designation": "UCFL214", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL214" ], "naming_rule_text": "UCFL214 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC214D1 insert in a JIS B 1559 FL214 housing. On the nameplate, UCFL214 decodes as a UC wide-inner-ring insert in a FL diamond flange, 2-series duty, 70 mm bore; the UC214D1 designation shows the D1 greasable execution. Boundary data for the 70 mm bore: 265 mm high flange, 160 mm long over the rhombus, 216 mm hole centres for M20 fasteners through 23 mm holes; insert OD is 125 mm. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC214D1 insert are 69 kN dynamic and 44 kN static; the assembled UCFL214 weighs about 5.4 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "The standard 2-series insert in UCFL214 is the lightest section at 70 mm — do not substitute it into a position that previously ran an X or 3 unit: the 216 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL214 pulls against the frame through only two M20 bolts on 216 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC214D1 insert of UCFL214 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 70 mm bore the 160 mm base of UCFL214 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCFL214 mounted bearing?", "a": "UCFL214 takes a 70 mm shaft (insert UC214D1, 125 mm OD) and has a unit mass of about 5.4 kg. Flange figures: height H 265 mm, length L 160 mm, bolt centres J 216 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL214 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 70 mm bore. UCFL214 is built from housing FL214 plus insert UC214D1 (D1 = greasable)." }, { "q": "How is UCFL214 locked to the shaft, and how tight should the setscrews be?", "a": "The UC214D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL214 instead of a pillow block?", "a": "Choose the UCFL214 two-bolt flange when the 70 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 216 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL314", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 70, "D_mm": 150, "B_mm": 78, "seal_type": "2RS", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "weight_g": 8600, "housing_height_mm": 315, "base_length_mm": 185, "bolt_spacing_mm": 250, "bolt_size_mm": 35, "manufacturer_designation": "UCFL314", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL314" ], "naming_rule_text": "For a 70 mm shaft ending at or passing through a vertical frame face, NTN UCFL314 is the diamond-flange answer: UC314D1 insert inside the FL314 cast-iron housing. The UCFL314 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 70 mm; FL314 and UC314D1 are the separate housing and insert part numbers inside. Shaft size is 70 mm; the 315 mm overall-height flange is 185 mm long across the rhombus (L), with its two mounting holes on 250 mm centres (J) clearing 35 mm M30 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Textile and fibre-processing machines use these units on long line-shafting; several bearings share one shaft, and the self-aligning feature prevents one poor bracket from loading its neighbours. A film of anti-seize on the spherical surfaces at assembly prevents fretting corrosion welding insert to housing — the failure mode that turns a five-minute insert swap into a housing replacement. Basic ratings of the UC314D1 insert are 115 kN dynamic and 68 kN static; the assembled UCFL314 weighs about 8.6 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "When ordering covers for UCFL314, note the steel and cast-iron cover executions change the unit mass and envelope but not the 250 mm mounting centres.", "Heavy drives on UCFL314 should have the setscrews re-torqued after the first day; at 70 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The 3-series insert makes UCFL314 the highest-rated unit at 70 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL314 pulls against the frame through only two M30 bolts on 250 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFL314 with a bare UC314D1 bearing: replacing only the insert is possible, but the housing FL314 must be unworn and the spherical seat cleaned and coated with anti-seize." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL314 instead of a pillow block?", "a": "Choose the UCFL314 two-bolt flange when the 70 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M30 bolts on 250 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL314 unit carry?", "a": "The UC314D1 insert is rated at 115 kN dynamic and 68 kN basic static (fatigue load limit 5.1 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL314 mounted bearing?", "a": "UCFL314 takes a 70 mm shaft (insert UC314D1, 150 mm OD) and has a unit mass of about 8.6 kg. Flange figures: height H 315 mm, length L 185 mm, bolt centres J 250 mm, holes 35 mm for M30 bolts." }, { "q": "What does the UCFL314 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 70 mm bore. UCFL314 is built from housing FL314 plus insert UC314D1 (D1 = greasable)." }, { "q": "How is UCFL314 locked to the shaft, and how tight should the setscrews be?", "a": "The UC314D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL215", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 75, "D_mm": 130, "B_mm": 77.8, "seal_type": "2RS", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "weight_g": 6000, "housing_height_mm": 275, "base_length_mm": 165, "bolt_spacing_mm": 225, "bolt_size_mm": 23, "manufacturer_designation": "UCFL215", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL215" ], "naming_rule_text": "For a 75 mm shaft ending at or passing through a vertical frame face, NTN UCFL215 is the diamond-flange answer: UC215D1 insert inside the FL215 cast-iron housing. The UCFL215 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 75 mm; FL215 and UC215D1 are the separate housing and insert part numbers inside. Shaft size is 75 mm; the 275 mm overall-height flange is 165 mm long across the rhombus (L), with its two mounting holes on 225 mm centres (J) clearing 23 mm M20 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC215D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCFL215 weighs about 6.0 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "When ordering covers for UCFL215, note the steel and cast-iron cover executions change the unit mass and envelope but not the 225 mm mounting centres.", "UCFL215 at 75 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 275 mm centre height and binds the insert.", "The standard 2-series insert in UCFL215 is the lightest section at 75 mm — do not substitute it into a position that previously ran an X or 3 unit: the 225 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL215 pulls against the frame through only two M20 bolts on 225 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFL215 with a bare UC215D1 bearing: replacing only the insert is possible, but the housing FL215 must be unworn and the spherical seat cleaned and coated with anti-seize." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL215 instead of a pillow block?", "a": "Choose the UCFL215 two-bolt flange when the 75 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 225 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL215 unit carry?", "a": "The UC215D1 insert is rated at 73.5 kN dynamic and 49.5 kN basic static (fatigue load limit 3.8 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL215 mounted bearing?", "a": "UCFL215 takes a 75 mm shaft (insert UC215D1, 130 mm OD) and has a unit mass of about 6.0 kg. Flange figures: height H 275 mm, length L 165 mm, bolt centres J 225 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL215 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 75 mm bore. UCFL215 is built from housing FL215 plus insert UC215D1 (D1 = greasable)." }, { "q": "How is UCFL215 locked to the shaft, and how tight should the setscrews be?", "a": "The UC215D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL315", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 75, "D_mm": 160, "B_mm": 82, "seal_type": "2RS", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "weight_g": 9800, "housing_height_mm": 320, "base_length_mm": 195, "bolt_spacing_mm": 260, "bolt_size_mm": 35, "manufacturer_designation": "UCFL315", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL315" ], "naming_rule_text": "UCFL315 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC315D1 ball bearing insert pre-assembled in a FL315 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 75 mm bore. Key mounting figures: flange height H = 320 mm, overall length L = 195 mm across the diamond, bolt centres J = 260 mm, and each ear takes a 35 mm (M30) fastener for the 75 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. On industrial centrifugal fans this size is standard at both shaft ends; fan loads are light but belt tension is not, and the cast housing dissipates the heat conducted out of the insert. Shim under the feet, never file the sole: full-area shim packs on both sides keep the bolt clamp load spread across the base, while a single thin shim pivots the housing and preloads the bearing. Basic ratings of the UC315D1 insert are 126 kN dynamic and 77 kN static; the assembled UCFL315 weighs about 9.8 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "UCFL315 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 75 mm journal over time.", "At 75 mm bore the 195 mm base of UCFL315 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCFL315 the highest-rated unit at 75 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL315 pulls against the frame through only two M30 bolts on 260 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL315 locked to the shaft, and how tight should the setscrews be?", "a": "The UC315D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL315 instead of a pillow block?", "a": "Choose the UCFL315 two-bolt flange when the 75 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M30 bolts on 260 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL315 mounted bearing?", "a": "UCFL315 takes a 75 mm shaft (insert UC315D1, 160 mm OD) and has a unit mass of about 9.8 kg. Flange figures: height H 320 mm, length L 195 mm, bolt centres J 260 mm, holes 35 mm for M30 bolts." }, { "q": "What does the UCFL315 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 75 mm bore. UCFL315 is built from housing FL315 plus insert UC315D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL216", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 80, "D_mm": 140, "B_mm": 82.6, "seal_type": "2RS", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "weight_g": 7400, "housing_height_mm": 290, "base_length_mm": 180, "bolt_spacing_mm": 233, "bolt_size_mm": 25, "manufacturer_designation": "UCFL216", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL216" ], "naming_rule_text": "UCFL216 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC216D1 ball bearing insert pre-assembled in a FL216 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 80 mm bore. Key mounting figures: flange height H = 290 mm, overall length L = 180 mm across the diamond, bolt centres J = 233 mm, and each ear takes a 25 mm (M22) fastener for the 80 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC216D1 insert are 80.5 kN dynamic and 53 kN static; the assembled UCFL216 weighs about 7.4 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "UCFL216 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 80 mm journal over time.", "Heavy drives on UCFL216 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The standard 2-series insert in UCFL216 is the lightest section at 80 mm — do not substitute it into a position that previously ran an X or 3 unit: the 233 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL216 pulls against the frame through only two M22 bolts on 233 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL216 locked to the shaft, and how tight should the setscrews be?", "a": "The UC216D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL216 instead of a pillow block?", "a": "Choose the UCFL216 two-bolt flange when the 80 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 233 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL216 mounted bearing?", "a": "UCFL216 takes a 80 mm shaft (insert UC216D1, 140 mm OD) and has a unit mass of about 7.4 kg. Flange figures: height H 290 mm, length L 180 mm, bolt centres J 233 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL216 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 80 mm bore. UCFL216 is built from housing FL216 plus insert UC216D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL316", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 80, "D_mm": 170, "B_mm": 86, "seal_type": "2RS", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "weight_g": 13000, "housing_height_mm": 355, "base_length_mm": 210, "bolt_spacing_mm": 285, "bolt_size_mm": 38, "manufacturer_designation": "UCFL316", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL316" ], "naming_rule_text": "The NTN UCFL316 flanged unit combines a sealed UC316D1 insert with a diamond-shaped FL316 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 80 mm shaft size; the unit is built from insert UC316D1 and housing FL316. For the frame-face drawing of UCFL316: the two holes are 285 mm apart (J), the rhombus spans 210 mm (L) and 355 mm (H), and M33 (38 mm) bolts clamp it around the 80 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC316D1 insert are 136 kN dynamic and 86.5 kN static; the assembled UCFL316 weighs about 13.0 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCFL316 the highest-rated unit at 80 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL316 pulls against the frame through only two M33 bolts on 285 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL316 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the FL316 housing of UCFL316: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "UCFL316 at 80 mm uses M33 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 355 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCFL316 mounted bearing?", "a": "UCFL316 takes a 80 mm shaft (insert UC316D1, 170 mm OD) and has a unit mass of about 13.0 kg. Flange figures: height H 355 mm, length L 210 mm, bolt centres J 285 mm, holes 38 mm for M33 bolts." }, { "q": "What does the UCFL316 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 80 mm bore. UCFL316 is built from housing FL316 plus insert UC316D1 (D1 = greasable)." }, { "q": "How is UCFL316 locked to the shaft, and how tight should the setscrews be?", "a": "The UC316D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL316 instead of a pillow block?", "a": "Choose the UCFL316 two-bolt flange when the 80 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 285 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL316 unit?", "a": "There is no single interval for UCFL316: the UC316D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL217", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 85, "D_mm": 150, "B_mm": 85.7, "seal_type": "2RS", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "weight_g": 8800, "housing_height_mm": 305, "base_length_mm": 190, "bolt_spacing_mm": 248, "bolt_size_mm": 25, "manufacturer_designation": "UCFL217", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL217" ], "naming_rule_text": "The NTN UCFL217 flanged unit combines a sealed UC217D1 insert with a diamond-shaped FL217 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 85 mm shaft size; the unit is built from insert UC217D1 and housing FL217. For the frame-face drawing of UCFL217: the two holes are 248 mm apart (J), the rhombus spans 190 mm (L) and 305 mm (H), and M22 (25 mm) bolts clamp it around the 85 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC217D1 insert are 92 kN dynamic and 64 kN static; the assembled UCFL217 weighs about 8.8 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The standard 2-series insert in UCFL217 is the lightest section at 85 mm — do not substitute it into a position that previously ran an X or 3 unit: the 248 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL217 pulls against the frame through only two M22 bolts on 248 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL217 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the FL217 housing of UCFL217: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "At 85 mm bore the 190 mm base of UCFL217 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCFL217 mounted bearing?", "a": "UCFL217 takes a 85 mm shaft (insert UC217D1, 150 mm OD) and has a unit mass of about 8.8 kg. Flange figures: height H 305 mm, length L 190 mm, bolt centres J 248 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL217 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 85 mm bore. UCFL217 is built from housing FL217 plus insert UC217D1 (D1 = greasable)." }, { "q": "How is UCFL217 locked to the shaft, and how tight should the setscrews be?", "a": "The UC217D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL217 instead of a pillow block?", "a": "Choose the UCFL217 two-bolt flange when the 85 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 248 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL217 unit?", "a": "There is no single interval for UCFL217: the UC217D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL317", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 85, "D_mm": 180, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "weight_g": 15000, "housing_height_mm": 370, "base_length_mm": 220, "bolt_spacing_mm": 300, "bolt_size_mm": 38, "manufacturer_designation": "UCFL317", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL317" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL317 is the two-bolt rhombus flange option for a 85 mm shaft: insert UC317D1, housing FL317, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL317 means the FL317 housing carrying the UC317D1 insert, with the last two digits denoting the 85 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 370 mm flange height, L 220 mm across the ears, J 300 mm between the 38 mm holes, and a 85 mm shaft through the 180 mm OD UC317D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC317D1 insert are 147 kN dynamic and 97 kN static; the assembled UCFL317 weighs about 15.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "The 3-series insert makes UCFL317 the highest-rated unit at 85 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL317 pulls against the frame through only two M33 bolts on 300 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL317, note the steel and cast-iron cover executions change the unit mass and envelope but not the 300 mm mounting centres.", "Heavy drives on UCFL317 should have the setscrews re-torqued after the first day; at 85 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks." ], "faq": [ { "q": "What are the dimensions of an UCFL317 mounted bearing?", "a": "UCFL317 takes a 85 mm shaft (insert UC317D1, 180 mm OD) and has a unit mass of about 15.0 kg. Flange figures: height H 370 mm, length L 220 mm, bolt centres J 300 mm, holes 38 mm for M33 bolts." }, { "q": "What does the UCFL317 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 85 mm bore. UCFL317 is built from housing FL317 plus insert UC317D1 (D1 = greasable)." }, { "q": "How is UCFL317 locked to the shaft, and how tight should the setscrews be?", "a": "The UC317D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL317 instead of a pillow block?", "a": "Choose the UCFL317 two-bolt flange when the 85 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 300 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL218", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 90, "D_mm": 160, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "weight_g": 11000, "housing_height_mm": 320, "base_length_mm": 205, "bolt_spacing_mm": 265, "bolt_size_mm": 25, "manufacturer_designation": "UCFL218", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL218" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL218 is the two-bolt rhombus flange option for a 90 mm shaft: insert UC218D1, housing FL218, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL218 means the FL218 housing carrying the UC218D1 insert, with the last two digits denoting the 90 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 320 mm flange height, L 205 mm across the ears, J 265 mm between the 25 mm holes, and a 90 mm shaft through the 160 mm OD UC218D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC218D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCFL218 weighs about 11.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "The standard 2-series insert in UCFL218 is the lightest section at 90 mm — do not substitute it into a position that previously ran an X or 3 unit: the 265 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL218 pulls against the frame through only two M22 bolts on 265 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL218, note the steel and cast-iron cover executions change the unit mass and envelope but not the 265 mm mounting centres.", "UCFL218 at 90 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 320 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCFL218 mounted bearing?", "a": "UCFL218 takes a 90 mm shaft (insert UC218D1, 160 mm OD) and has a unit mass of about 11.0 kg. Flange figures: height H 320 mm, length L 205 mm, bolt centres J 265 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL218 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 90 mm bore. UCFL218 is built from housing FL218 plus insert UC218D1 (D1 = greasable)." }, { "q": "How is UCFL218 locked to the shaft, and how tight should the setscrews be?", "a": "The UC218D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL218 instead of a pillow block?", "a": "Choose the UCFL218 two-bolt flange when the 90 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 265 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL318", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 90, "D_mm": 190, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "weight_g": 17000, "housing_height_mm": 385, "base_length_mm": 235, "bolt_spacing_mm": 315, "bolt_size_mm": 38, "manufacturer_designation": "UCFL318", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL318" ], "naming_rule_text": "NTN delivers UCFL318 as a matched unit — the UC318D1 insert is locked into the FL318 rhombus cast-iron flange at the factory and arrives greased and sealed. On the nameplate, UCFL318 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 90 mm bore; the UC318D1 designation shows the D1 greasable execution. Boundary data for the 90 mm bore: 385 mm high flange, 235 mm long over the rhombus, 315 mm hole centres for M33 fasteners through 38 mm holes; insert OD is 190 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC318D1 insert are 158 kN dynamic and 107 kN static; the assembled UCFL318 weighs about 17.0 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "The D1 suffix on UC318D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL318 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC318D1 insert of UCFL318 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 90 mm bore the 235 mm base of UCFL318 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCFL318 the highest-rated unit at 90 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL318 pulls against the frame through only two M33 bolts on 315 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL318 locked to the shaft, and how tight should the setscrews be?", "a": "The UC318D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL318 instead of a pillow block?", "a": "Choose the UCFL318 two-bolt flange when the 90 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 315 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Can I replace just the insert inside an UCFL318 unit?", "a": "Yes — UCFL318 is an assembly of the FL318 housing and UC318D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 90 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCFL318 mounted bearing?", "a": "UCFL318 takes a 90 mm shaft (insert UC318D1, 190 mm OD) and has a unit mass of about 17.0 kg. Flange figures: height H 385 mm, length L 235 mm, bolt centres J 315 mm, holes 38 mm for M33 bolts." }, { "q": "What does the UCFL318 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 90 mm bore. UCFL318 is built from housing FL318 plus insert UC318D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL319", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 95, "D_mm": 200, "B_mm": 103, "seal_type": "2RS", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "weight_g": 23000, "housing_height_mm": 405, "base_length_mm": 250, "bolt_spacing_mm": 330, "bolt_size_mm": 41, "manufacturer_designation": "UCFL319", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL319" ], "naming_rule_text": "UCFL319 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC319D1 insert in a JIS B 1559 FL319 housing. The UCFL319 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 95 mm; FL319 and UC319D1 are the separate housing and insert part numbers inside. Shaft size is 95 mm; the 405 mm overall-height flange is 250 mm long across the rhombus (L), with its two mounting holes on 330 mm centres (J) clearing 41 mm M36 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC319D1 insert are 169 kN dynamic and 119 kN static; the assembled UCFL319 weighs about 23.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "Never weld a bracket to the FL319 housing of UCFL319: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "XL units like UCFL319 (95 mm bore, M36 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCFL319 the highest-rated unit at 95 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL319 pulls against the frame through only two M36 bolts on 330 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL319 locked to the shaft, and how tight should the setscrews be?", "a": "The UC319D1 insert uses two collar setscrews on the 95 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL319 instead of a pillow block?", "a": "Choose the UCFL319 two-bolt flange when the 95 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M36 bolts on 330 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL319 mounted bearing?", "a": "UCFL319 takes a 95 mm shaft (insert UC319D1, 200 mm OD) and has a unit mass of about 23.0 kg. Flange figures: height H 405 mm, length L 250 mm, bolt centres J 330 mm, holes 41 mm for M36 bolts." }, { "q": "What does the UCFL319 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 95 mm bore. UCFL319 is built from housing FL319 plus insert UC319D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL320", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 100, "D_mm": 215, "B_mm": 108, "seal_type": "2RS", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "weight_g": 26000, "housing_height_mm": 440, "base_length_mm": 270, "bolt_spacing_mm": 360, "bolt_size_mm": 44, "manufacturer_designation": "UCFL320", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL320" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL320 is the two-bolt rhombus flange option for a 100 mm shaft: insert UC320D1, housing FL320, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 100 mm shaft size; the unit is built from insert UC320D1 and housing FL320. For the frame-face drawing of UCFL320: the two holes are 360 mm apart (J), the rhombus spans 270 mm (L) and 440 mm (H), and M39 (44 mm) bolts clamp it around the 100 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC320D1 insert are 192 kN dynamic and 141 kN static; the assembled UCFL320 weighs about 26.0 kg.", "applications": [ "steel-plant roller tables", "large induced-draft fans", "quarry and aggregate screens", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The 3-series insert makes UCFL320 the highest-rated unit at 100 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL320 pulls against the frame through only two M39 bolts on 360 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL320, note the steel and cast-iron cover executions change the unit mass and envelope but not the 360 mm mounting centres.", "Foundation design for UCFL320 must resist the belt-pull reaction at 440 mm centre height — a moment arm this large walks an inadequately anchored base under load." ], "faq": [ { "q": "What are the dimensions of an UCFL320 mounted bearing?", "a": "UCFL320 takes a 100 mm shaft (insert UC320D1, 215 mm OD) and has a unit mass of about 26.0 kg. Flange figures: height H 440 mm, length L 270 mm, bolt centres J 360 mm, holes 44 mm for M39 bolts." }, { "q": "What does the UCFL320 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 100 mm bore. UCFL320 is built from housing FL320 plus insert UC320D1 (D1 = greasable)." }, { "q": "How is UCFL320 locked to the shaft, and how tight should the setscrews be?", "a": "The UC320D1 insert uses two collar setscrews on the 100 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL320 instead of a pillow block?", "a": "Choose the UCFL320 two-bolt flange when the 100 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M39 bolts on 360 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL320", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL321", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 105, "D_mm": 225, "B_mm": 112, "seal_type": "2RS", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "weight_g": 27000, "housing_height_mm": 440, "base_length_mm": 270, "bolt_spacing_mm": 360, "bolt_size_mm": 44, "manufacturer_designation": "UCFL321", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL321" ], "naming_rule_text": "NTN delivers UCFL321 as a matched unit — the UC321D1 insert is locked into the FL321 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL321 means the FL321 housing carrying the UC321D1 insert, with the last two digits denoting the 105 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 440 mm flange height, L 270 mm across the ears, J 360 mm between the 44 mm holes, and a 105 mm shaft through the 225 mm OD UC321D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC321D1 insert are 204 kN dynamic and 153 kN static; the assembled UCFL321 weighs about 27.0 kg.", "applications": [ "large induced-draft fans", "quarry and aggregate screens", "ship-loader and stacker drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL321 pulls against the frame through only two M39 bolts on 360 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC321D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL321 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC321D1 insert of UCFL321 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 105 mm bore, rigging and alignment dominate the UCFL321 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.", "The 3-series insert makes UCFL321 the highest-rated unit at 105 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCFL321 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 105 mm bore. UCFL321 is built from housing FL321 plus insert UC321D1 (D1 = greasable)." }, { "q": "How is UCFL321 locked to the shaft, and how tight should the setscrews be?", "a": "The UC321D1 insert uses two collar setscrews on the 105 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL321 instead of a pillow block?", "a": "Choose the UCFL321 two-bolt flange when the 105 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M39 bolts on 360 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL321 bearing self-aligning?", "a": "Yes within limits. The UC321D1 insert has a spherical outer diameter that pivots in the FL321 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL321 mounted bearing?", "a": "UCFL321 takes a 105 mm shaft (insert UC321D1, 225 mm OD) and has a unit mass of about 27.0 kg. Flange figures: height H 440 mm, length L 270 mm, bolt centres J 360 mm, holes 44 mm for M39 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL321", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL322", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 110, "D_mm": 240, "B_mm": 117, "seal_type": "2RS", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "weight_g": 34000, "housing_height_mm": 470, "base_length_mm": 300, "bolt_spacing_mm": 390, "bolt_size_mm": 44, "manufacturer_designation": "UCFL322", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL322" ], "naming_rule_text": "UCFL322 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC322D1 insert in a JIS B 1559 FL322 housing. On the nameplate, UCFL322 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 110 mm bore; the UC322D1 designation shows the D1 greasable execution. Boundary data for the 110 mm bore: 470 mm high flange, 300 mm long over the rhombus, 390 mm hole centres for M39 fasteners through 44 mm holes; insert OD is 240 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC322D1 insert are 227 kN dynamic and 179 kN static; the assembled UCFL322 weighs about 34.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the FL322 housing of UCFL322: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "XL units like UCFL322 (110 mm bore, M39 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCFL322 the highest-rated unit at 110 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL322 pulls against the frame through only two M39 bolts on 390 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL322 locked to the shaft, and how tight should the setscrews be?", "a": "The UC322D1 insert uses two collar setscrews on the 110 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL322 instead of a pillow block?", "a": "Choose the UCFL322 two-bolt flange when the 110 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M39 bolts on 390 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL322 mounted bearing?", "a": "UCFL322 takes a 110 mm shaft (insert UC322D1, 240 mm OD) and has a unit mass of about 34.0 kg. Flange figures: height H 470 mm, length L 300 mm, bolt centres J 390 mm, holes 44 mm for M39 bolts." }, { "q": "What does the UCFL322 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 110 mm bore. UCFL322 is built from housing FL322 plus insert UC322D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL322", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL324", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 120, "D_mm": 260, "B_mm": 126, "seal_type": "2RS", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "weight_g": 48000, "housing_height_mm": 520, "base_length_mm": 330, "bolt_spacing_mm": 430, "bolt_size_mm": 47, "manufacturer_designation": "UCFL324", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL324" ], "naming_rule_text": "UCFL324 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC324D1 ball bearing insert pre-assembled in a FL324 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 120 mm bore. Key mounting figures: flange height H = 520 mm, overall length L = 330 mm across the diamond, bolt centres J = 430 mm, and each ear takes a 47 mm (M42) fastener for the 120 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. On industrial centrifugal fans this size is standard at both shaft ends; fan loads are light but belt tension is not, and the cast housing dissipates the heat conducted out of the insert. Shim under the feet, never file the sole: full-area shim packs on both sides keep the bolt clamp load spread across the base, while a single thin shim pivots the housing and preloads the bearing. Basic ratings of the UC324D1 insert are 229 kN dynamic and 185 kN static; the assembled UCFL324 weighs about 48.0 kg.", "applications": [ "mining and port conveyor pulleys", "primary crusher feeders", "steel-plant roller tables", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The 3-series insert makes UCFL324 the highest-rated unit at 120 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL324 pulls against the frame through only two M42 bolts on 430 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC324D1 insert of UCFL324 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 120 mm bore, rigging and alignment dominate the UCFL324 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted." ], "faq": [ { "q": "What are the dimensions of an UCFL324 mounted bearing?", "a": "UCFL324 takes a 120 mm shaft (insert UC324D1, 260 mm OD) and has a unit mass of about 48.0 kg. Flange figures: height H 520 mm, length L 330 mm, bolt centres J 430 mm, holes 47 mm for M42 bolts." }, { "q": "What does the UCFL324 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 120 mm bore. UCFL324 is built from housing FL324 plus insert UC324D1 (D1 = greasable)." }, { "q": "How is UCFL324 locked to the shaft, and how tight should the setscrews be?", "a": "The UC324D1 insert uses two collar setscrews on the 120 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL324 instead of a pillow block?", "a": "Choose the UCFL324 two-bolt flange when the 120 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M42 bolts on 430 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL326", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 130, "D_mm": 280, "B_mm": 135, "seal_type": "2RS", "dynamic_load_kN": 254, "static_load_kN": 214, "fatigue_load_limit_kN": 11.7, "weight_g": 58000, "housing_height_mm": 550, "base_length_mm": 360, "bolt_spacing_mm": 460, "bolt_size_mm": 47, "manufacturer_designation": "UCFL326", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL326" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL326 is the two-bolt rhombus flange option for a 130 mm shaft: insert UC326D1, housing FL326, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL326 means the FL326 housing carrying the UC326D1 insert, with the last two digits denoting the 130 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 550 mm flange height, L 360 mm across the ears, J 460 mm between the 47 mm holes, and a 130 mm shaft through the 280 mm OD UC326D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC326D1 insert are 254 kN dynamic and 214 kN static; the assembled UCFL326 weighs about 58.0 kg.", "applications": [ "steel-plant roller tables", "large induced-draft fans", "quarry and aggregate screens", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "UCFL326 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 130 mm journal over time.", "Foundation design for UCFL326 must resist the belt-pull reaction at 550 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCFL326 the highest-rated unit at 130 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL326 pulls against the frame through only two M42 bolts on 460 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL326 locked to the shaft, and how tight should the setscrews be?", "a": "The UC326D1 insert uses two collar setscrews on the 130 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL326 instead of a pillow block?", "a": "Choose the UCFL326 two-bolt flange when the 130 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M42 bolts on 460 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL326 mounted bearing?", "a": "UCFL326 takes a 130 mm shaft (insert UC326D1, 280 mm OD) and has a unit mass of about 58.0 kg. Flange figures: height H 550 mm, length L 360 mm, bolt centres J 460 mm, holes 47 mm for M42 bolts." }, { "q": "What does the UCFL326 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 130 mm bore. UCFL326 is built from housing FL326 plus insert UC326D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL326", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL328", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 140, "D_mm": 300, "B_mm": 145, "seal_type": "2RS", "dynamic_load_kN": 280, "static_load_kN": 246, "fatigue_load_limit_kN": 13, "weight_g": 81000, "housing_height_mm": 600, "base_length_mm": 400, "bolt_spacing_mm": 500, "bolt_size_mm": 51, "manufacturer_designation": "UCFL328", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL328" ], "naming_rule_text": "UCFL328 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC328D1 insert in a JIS B 1559 FL328 housing. The UCFL328 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 140 mm; FL328 and UC328D1 are the separate housing and insert part numbers inside. Shaft size is 140 mm; the 600 mm overall-height flange is 400 mm long across the rhombus (L), with its two mounting holes on 500 mm centres (J) clearing 51 mm M45 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC328D1 insert are 280 kN dynamic and 246 kN static; the assembled UCFL328 weighs about 81.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "The 3-series insert makes UCFL328 the highest-rated unit at 140 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL328 pulls against the frame through only two M45 bolts on 500 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL328, note the steel and cast-iron cover executions change the unit mass and envelope but not the 500 mm mounting centres.", "XL units like UCFL328 (140 mm bore, M45 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking." ], "faq": [ { "q": "What are the dimensions of an UCFL328 mounted bearing?", "a": "UCFL328 takes a 140 mm shaft (insert UC328D1, 300 mm OD) and has a unit mass of about 81.0 kg. Flange figures: height H 600 mm, length L 400 mm, bolt centres J 500 mm, holes 51 mm for M45 bolts." }, { "q": "What does the UCFL328 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 140 mm bore. UCFL328 is built from housing FL328 plus insert UC328D1 (D1 = greasable)." }, { "q": "How is UCFL328 locked to the shaft, and how tight should the setscrews be?", "a": "The UC328D1 insert uses two collar setscrews on the 140 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL328 instead of a pillow block?", "a": "Choose the UCFL328 two-bolt flange when the 140 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M45 bolts on 500 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL328", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "N204EA", "brand": "NTN", "manufacturer_designation": "NTN N204EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 24.7, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 15000, "max_rpm": 15000, "speed_oil_rpm": 21600, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N204EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 32.5 kN dynamic rating in the 20 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N204EA floats or locates; the numeric remainder is the ISO 15 series and 20 mm bore reference, not a fit or clearance instruction. The 13.5 mm radial section ((47−20)/2) frames the roller complement; capacity per millimetre of bore is about 1.6 kN/mm before application factors. Equivalent-load planning treats N204EA as a pure radial bearing: keep P below 32.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 20 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N204EA rollers smear even with correct grease.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "Grease limiting speed 15,000 r/min and oil 21,600 r/min are different limits for N204EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 13.5 mm section at 20 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 14 mm-wide cavity.", "The 32.5/24.7 kN ratings, 3 kN Pu and 110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N204EA?", "a": "N204EA is an NTN N single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 14 mm width (0.787 × 1.85 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 32.5 kN, C0 24.7 kN, Pu 3 kN, grease limiting speed 15,000 r/min, oil 21,600 r/min, mass about 110 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N204EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N204EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 15,000 r/min grease / 21,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n204ea", "＊n204ea", "N204EA" ], "locale_variants": {} }, { "sku": "N2204EA", "brand": "NTN", "manufacturer_designation": "NTN N2204EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 38.5, "static_load_kN": 31, "fatigue_load_limit_kN": 3.75, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 19200, "weight_g": 144, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2204EA is the wide (22) section of the NTN N2200 dimension series for a 20 mm shaft — 38.5 kN of basic dynamic capacity in a 144 g, open bearing. Numbering ties N2204EA to its envelope: type code N, series N2200, 20 mm bore; the 47×18 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 26.5 mm and Ew 41.5 mm — the envelope inside the 20/47 mm bore/OD where the rollers actually run. Mass 144 g for the 20×47×18 mm N2204EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2204EA.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N2204EA rollers smear even with correct grease.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2204EA skids at 14,000 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "The N rib arrangement is not interchangeable with another prefix on the same 20 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 47×18 mm envelope matches.", "The 38.5/31 kN ratings, 3.75 kN Pu and 144 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2204EA?", "a": "N2204EA is an NTN N single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 18 mm width (0.787 × 1.85 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 38.5 kN, C0 31 kN, Pu 3.75 kN, grease limiting speed 14,000 r/min, oil 19,200 r/min, mass about 144 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2204EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2204EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 19,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2204ea", "＊n2204ea", "N2204EA" ], "locale_variants": {} }, { "sku": "NF204EA", "brand": "NTN", "manufacturer_designation": "NTN NF204EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 24.7, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 15000, "max_rpm": 15000, "speed_oil_rpm": 21600, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF204EA denotes a 20×47×14 mm (0.787 × 1.85 × 0.551 in) cylindrical roller bearing in the NF200 family, the EA high-capacity pressed sheet-steel cage. Numbering ties NF204EA to its envelope: type code NF, series NF200, 20 mm bore; the 47×14 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 15,000 r/min grease and 21,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 20 mm bore. Rating life at 32.5 kN C assumes clean oil and adequate film; the 3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 20 mm shaft.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF204EA rollers smear even with correct grease.", "The NF rib arrangement is not interchangeable with another prefix on the same 20 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 47×14 mm envelope matches.", "Open NF204EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 20 mm contact.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NF204EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 32.5/24.7 kN ratings, 3 kN Pu and 110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF204EA?", "a": "NF204EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 14 mm width (0.787 × 1.85 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 32.5 kN, C0 24.7 kN, Pu 3 kN, grease limiting speed 15,000 r/min, oil 21,600 r/min, mass about 110 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF204EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF204EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 15,000 r/min grease / 21,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf204ea", "＊nf204ea", "NF204EA" ], "locale_variants": {} }, { "sku": "NF2204EA", "brand": "NTN", "manufacturer_designation": "NTN NF2204EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 38.5, "static_load_kN": 31, "fatigue_load_limit_kN": 3.75, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 19200, "weight_g": 144, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF2204EA appears as a 20 mm bore single-row cylindrical roller bearing (38.5 kN C / 31 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 20 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 26.5 mm and Ew 41.5 mm — the envelope inside the 20/47 mm bore/OD where the rollers actually run. Mass 144 g for the 20×47×18 mm NF2204EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 20 mm shaft.", "applications": [ "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF2204EA rollers smear even with correct grease.", "The NF rib arrangement is not interchangeable with another prefix on the same 20 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 47×18 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 38.5/31 kN pair here belongs to NF2204EA as printed, not to the bare size.", "The NF rib arrangement is not interchangeable with another prefix on the same 20 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 47×18 mm envelope matches.", "The 38.5/31 kN ratings, 3.75 kN Pu and 144 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2204EA?", "a": "NF2204EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 18 mm width (0.787 × 1.85 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 38.5 kN, C0 31 kN, Pu 3.75 kN, grease limiting speed 14,000 r/min, oil 19,200 r/min, mass about 144 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2204EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2204EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 19,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2204ea", "＊nf2204ea", "NF2204EA" ], "locale_variants": {} }, { "sku": "NJ204EA", "brand": "NTN", "manufacturer_designation": "NTN NJ204EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 24.7, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 15000, "max_rpm": 15000, "speed_oil_rpm": 21600, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ204EA appears as a 20 mm bore single-row cylindrical roller bearing (32.5 kN C / 24.7 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ204EA to its envelope: type code NJ, series NJ200, 20 mm bore; the 47×14 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 15,000 r/min grease and 21,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 20 mm bore. Speed ratio check: limiting 15,000 r/min is .69 of the 21,600 r/min oil value for NJ204EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ204EA.", "applications": [ "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ204EA rollers smear even with correct grease.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "The NJ rib arrangement is not interchangeable with another prefix on the same 20 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 47×14 mm envelope matches.", "Open NJ204EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 20 mm contact.", "If the shaft must be located both ways, do not use NJ204EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 32.5/24.7 kN ratings, 3 kN Pu and 110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ204EA?", "a": "NJ204EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 14 mm width (0.787 × 1.85 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 32.5 kN, C0 24.7 kN, Pu 3 kN, grease limiting speed 15,000 r/min, oil 21,600 r/min, mass about 110 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ204EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ204EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 15,000 r/min grease / 21,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj204ea", "＊nj204ea", "NJ204EA" ], "locale_variants": {} }, { "sku": "NJ2204EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2204EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 38.5, "static_load_kN": 31, "fatigue_load_limit_kN": 3.75, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 19200, "weight_g": 144, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2204EA appears as a 20 mm bore single-row cylindrical roller bearing (38.5 kN C / 31 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 20 mm, with 47 mm OD and 18 mm width from the ISO 15 general plan. With C 38.5 kN and C0 31 kN (C0/C ≈ 0.81) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 14,000 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 19,200 r/min for continuously high-duty 20 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2204EA.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ2204EA rollers smear even with correct grease.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 38.5/31 kN pair here belongs to NJ2204EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2204EA skids at 14,000 r/min and fails by smearing long before L10 fatigue.", "The 38.5/31 kN ratings, 3.75 kN Pu and 144 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2204EA?", "a": "NJ2204EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 18 mm width (0.787 × 1.85 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 38.5 kN, C0 31 kN, Pu 3.75 kN, grease limiting speed 14,000 r/min, oil 19,200 r/min, mass about 144 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2204EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2204EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 19,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2204ea", "＊nj2204ea", "NJ2204EA" ], "locale_variants": {} }, { "sku": "NU204EA", "brand": "NTN", "manufacturer_designation": "NTN NU204EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 24.7, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 15000, "max_rpm": 15000, "speed_oil_rpm": 21600, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU204EA on the 20×47 mm envelope, 14 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 15,000 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU204EA floats or locates; the numeric remainder is the ISO 15 series and 20 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU204EA designation when purchasing. Equivalent-load planning treats NU204EA as a pure radial bearing: keep P below 32.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU204EA rollers smear even with correct grease.", "The 14 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "The 13.5 mm section at 20 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 14 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 20 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 47×14 mm envelope matches.", "The 14 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "The 32.5/24.7 kN ratings, 3 kN Pu and 110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU204EA?", "a": "NU204EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 14 mm width (0.787 × 1.85 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 32.5 kN, C0 24.7 kN, Pu 3 kN, grease limiting speed 15,000 r/min, oil 21,600 r/min, mass about 110 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU204EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU204EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 15,000 r/min grease / 21,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu204ea", "＊nu204ea", "NU204EA" ], "locale_variants": {} }, { "sku": "NU2204EA", "brand": "NTN", "manufacturer_designation": "NTN NU2204EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 38.5, "static_load_kN": 31, "fatigue_load_limit_kN": 3.75, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 19200, "weight_g": 144, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2204EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 38.5 kN dynamic rating in the 20 mm bore. Digit by digit, NU2204EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 20 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2204EA. The 1.9 kN-per-mm-bore figure (38.5 kN over 20 mm) lets a NU2204EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 20 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU2204EA rollers smear even with correct grease.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 38.5/31 kN pair here belongs to NU2204EA as printed, not to the bare size.", "The 13.5 mm section at 20 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "The 38.5/31 kN ratings, 3.75 kN Pu and 144 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2204EA?", "a": "NU2204EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 18 mm width (0.787 × 1.85 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 38.5 kN, C0 31 kN, Pu 3.75 kN, grease limiting speed 14,000 r/min, oil 19,200 r/min, mass about 144 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2204EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2204EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 19,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2204ea", "＊nu2204ea", "NU2204EA" ], "locale_variants": {} }, { "sku": "NUP204EA", "brand": "NTN", "manufacturer_designation": "NTN NUP204EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 24.7, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 15000, "max_rpm": 15000, "speed_oil_rpm": 21600, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP204EA is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 20×47×14 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 20 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 15,000 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 21,600 r/min for continuously high-duty 20 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP204EA rollers smear even with correct grease.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP204EA skids at 15,000 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "The 14 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 32.5/24.7 kN pair here belongs to NUP204EA as printed, not to the bare size.", "The 32.5/24.7 kN ratings, 3 kN Pu and 110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP204EA?", "a": "NUP204EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 14 mm width (0.787 × 1.85 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 32.5 kN, C0 24.7 kN, Pu 3 kN, grease limiting speed 15,000 r/min, oil 21,600 r/min, mass about 110 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP204EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP204EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 15,000 r/min grease / 21,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup204ea", "＊nup204ea", "NUP204EA" ], "locale_variants": {} }, { "sku": "NUP2204EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2204EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 38.5, "static_load_kN": 31, "fatigue_load_limit_kN": 3.75, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 19200, "weight_g": 144, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2204EA is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 20×47×18 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2204EA floats or locates; the numeric remainder is the ISO 15 series and 20 mm bore reference, not a fit or clearance instruction. At 19,200 r/min with oil versus 14,000 r/min with grease (a 5,200 r/min band), lubrication choice for NUP2204EA is a thermal decision, not just a sealing one. The 20 mm (0.787 in) bore and 47 mm (1.85 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 18 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2204EA.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP2204EA rollers smear even with correct grease.", "Do not replace NUP2204EA with a deep-groove ball bearing on rating alone: line contact gives 38.5 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 13.5 mm section at 20 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "If the shaft must be located both ways, do not use NUP2204EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 14,000 r/min and oil 19,200 r/min are different limits for NUP2204EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 38.5/31 kN ratings, 3.75 kN Pu and 144 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2204EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2204EA?", "a": "NUP2204EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 20 mm bore, 47 mm OD and 18 mm width (0.787 × 1.85 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 38.5 kN, C0 31 kN, Pu 3.75 kN, grease limiting speed 14,000 r/min, oil 19,200 r/min, mass about 144 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2204EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2204EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2204EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 26.5 mm, Ew 41.5 mm. The nominal bore/OD remain 20/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 19,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2204EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2204ea", "＊nup2204ea", "NUP2204EA" ], "locale_variants": {} }, { "sku": "N2304EA", "brand": "NTN", "manufacturer_designation": "NTN N2304EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.5, "static_load_kN": 39, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 16800, "weight_g": 212, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 20 mm shaft NTN supplies N2304EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 12,000 r/min on grease and 16,800 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 20 mm, with 52 mm OD and 21 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives N2304EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 4.75 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.79 (39/49.5 kN) shows the high-static-capacity proportioning of this 20 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2304EA.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N2304EA rollers smear even with correct grease.", "Do not replace N2304EA with a deep-groove ball bearing on rating alone: line contact gives 49.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The N rib arrangement is not interchangeable with another prefix on the same 20 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 52×21 mm envelope matches.", "The N rib arrangement is not interchangeable with another prefix on the same 20 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 52×21 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 49.5/39 kN ratings, 4.75 kN Pu and 212 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2304EA?", "a": "N2304EA is an NTN N single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 21 mm width (0.787 × 2.047 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49.5 kN, C0 39 kN, Pu 4.75 kN, grease limiting speed 12,000 r/min, oil 16,800 r/min, mass about 212 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2304EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2304EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 16,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2304ea", "＊n2304ea", "N2304EA" ], "locale_variants": {} }, { "sku": "N304EA", "brand": "NTN", "manufacturer_designation": "NTN N304EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 26.9, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N304EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 20×52×15 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 20 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full N304EA designation when purchasing. Speed ratio check: limiting 13,000 r/min is .72 of the 18,000 r/min oil value for N304EA; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 20 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N304EA rollers smear even with correct grease.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N304EA skids at 13,000 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N304EA skids at 13,000 r/min and fails by smearing long before L10 fatigue.", "Open N304EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 20 mm contact.", "The 15 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "The 37.5/26.9 kN ratings, 3.25 kN Pu and 147 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N304EA?", "a": "N304EA is an NTN N single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 15 mm width (0.787 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 37.5 kN, C0 26.9 kN, Pu 3.25 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 147 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N304EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N304EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n304ea", "＊n304ea", "N304EA" ], "locale_variants": {} }, { "sku": "NF2304EA", "brand": "NTN", "manufacturer_designation": "NTN NF2304EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.5, "static_load_kN": 39, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 16800, "weight_g": 212, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF2304EA on the 20×52 mm envelope, 21 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 12,000 r/min. Digit by digit, NF2304EA reads as NF (one rib on each ring), ISO 15 series, and bore 20 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NF2304EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 4.75 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.79 (39/49.5 kN) shows the high-static-capacity proportioning of this 20 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 20 mm shaft.", "applications": [ "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF2304EA rollers smear even with correct grease.", "Grease limiting speed 12,000 r/min and oil 16,800 r/min are different limits for NF2304EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "The 16.0 mm section at 20 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 21 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full NF2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 49.5/39 kN ratings, 4.75 kN Pu and 212 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2304EA?", "a": "NF2304EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 21 mm width (0.787 × 2.047 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49.5 kN, C0 39 kN, Pu 4.75 kN, grease limiting speed 12,000 r/min, oil 16,800 r/min, mass about 212 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2304EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2304EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 16,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2304ea", "＊nf2304ea", "NF2304EA" ], "locale_variants": {} }, { "sku": "NF304EA", "brand": "NTN", "manufacturer_designation": "NTN NF304EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 26.9, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 20 mm shaft NTN supplies NF304EA: one integral rib on each ring; the open execution is rated 13,000 r/min on grease and 18,000 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 20 mm, with 52 mm OD and 15 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NF304EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 20 mm (0.787 in) bore and 52 mm (2.047 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 15 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF304EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF304EA rollers smear even with correct grease.", "Grease limiting speed 13,000 r/min and oil 18,000 r/min are different limits for NF304EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "Open NF304EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 20 mm contact.", "Do not replace NF304EA with a deep-groove ball bearing on rating alone: line contact gives 37.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 37.5/26.9 kN ratings, 3.25 kN Pu and 147 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF304EA?", "a": "NF304EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 15 mm width (0.787 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 37.5 kN, C0 26.9 kN, Pu 3.25 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 147 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF304EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF304EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf304ea", "＊nf304ea", "NF304EA" ], "locale_variants": {} }, { "sku": "NJ2304EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2304EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.5, "static_load_kN": 39, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 16800, "weight_g": 212, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2304EA on the 20×52 mm envelope, 21 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 12,000 r/min. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2304EA floats or locates; the numeric remainder is the ISO 15 series and 20 mm bore reference, not a fit or clearance instruction. The 21 mm width and 16.0 mm section put the NJ2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 49.5 kN C assumes clean oil and adequate film; the 4.75 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2304EA.", "applications": [ "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ2304EA rollers smear even with correct grease.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "Open NJ2304EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 20 mm contact.", "Open NJ2304EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 20 mm contact.", "The 49.5/39 kN ratings, 4.75 kN Pu and 212 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2304EA?", "a": "NJ2304EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 21 mm width (0.787 × 2.047 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49.5 kN, C0 39 kN, Pu 4.75 kN, grease limiting speed 12,000 r/min, oil 16,800 r/min, mass about 212 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2304EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2304EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 16,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2304ea", "＊nj2304ea", "NJ2304EA" ], "locale_variants": {} }, { "sku": "NJ304EA", "brand": "NTN", "manufacturer_designation": "NTN NJ304EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 26.9, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ304EA on the 20×52 mm envelope, 15 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 13,000 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 20 mm, with 52 mm OD and 15 mm width from the ISO 15 general plan. At 18,000 r/min with oil versus 13,000 r/min with grease (a 5,000 r/min band), lubrication choice for NJ304EA is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ304EA.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ304EA rollers smear even with correct grease.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ304EA skids at 13,000 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "Do not replace NJ304EA with a deep-groove ball bearing on rating alone: line contact gives 37.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 13,000 r/min and oil 18,000 r/min are different limits for NJ304EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 37.5/26.9 kN ratings, 3.25 kN Pu and 147 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ304EA?", "a": "NJ304EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 15 mm width (0.787 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 37.5 kN, C0 26.9 kN, Pu 3.25 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 147 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ304EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ304EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj304ea", "＊nj304ea", "NJ304EA" ], "locale_variants": {} }, { "sku": "NU2304EA", "brand": "NTN", "manufacturer_designation": "NTN NU2304EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.5, "static_load_kN": 39, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 16800, "weight_g": 212, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2304EA denotes a 20×52×21 mm (0.787 × 2.047 × 0.827 in) cylindrical roller bearing in the NU2300 family, the EA high-capacity pressed sheet-steel cage. Numbering ties NU2304EA to its envelope: type code NU, series NU2300, 20 mm bore; the 52×21 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU2304EA designation when purchasing. Mass 212 g for the 20×52×21 mm NU2304EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 20 mm shaft.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU2304EA rollers smear even with correct grease.", "Do not replace NU2304EA with a deep-groove ball bearing on rating alone: line contact gives 49.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NU2304EA with a deep-groove ball bearing on rating alone: line contact gives 49.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "The 49.5/39 kN ratings, 4.75 kN Pu and 212 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2304EA?", "a": "NU2304EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 21 mm width (0.787 × 2.047 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49.5 kN, C0 39 kN, Pu 4.75 kN, grease limiting speed 12,000 r/min, oil 16,800 r/min, mass about 212 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2304EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2304EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 16,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2304ea", "＊nu2304ea", "NU2304EA" ], "locale_variants": {} }, { "sku": "NU304EA", "brand": "NTN", "manufacturer_designation": "NTN NU304EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 26.9, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU304EA appears as a 20 mm bore single-row cylindrical roller bearing (37.5 kN C / 26.9 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 20 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 13,000 r/min grease and 18,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 20 mm bore. Speed ratio check: limiting 13,000 r/min is .72 of the 18,000 r/min oil value for NU304EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU304EA.", "applications": [ "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU304EA rollers smear even with correct grease.", "The NU rib arrangement is not interchangeable with another prefix on the same 20 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 52×15 mm envelope matches.", "If the shaft must be located both ways, do not use NU304EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU304EA skids at 13,000 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NU304EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 37.5/26.9 kN ratings, 3.25 kN Pu and 147 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU304EA?", "a": "NU304EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 15 mm width (0.787 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 37.5 kN, C0 26.9 kN, Pu 3.25 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 147 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU304EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU304EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu304ea", "＊nu304ea", "NU304EA" ], "locale_variants": {} }, { "sku": "NUP2304EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2304EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.5, "static_load_kN": 39, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 16800, "weight_g": 212, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2304EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 49.5 kN dynamic rating in the 20 mm bore. Digit by digit, NUP2304EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 20 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 49.5 kN and C0 39 kN (C0/C ≈ 0.79) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 49.5 kN C assumes clean oil and adequate film; the 4.75 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NUP2304EA; an oversized radius locks the ring on its face and tilts the 21 mm-wide seat.", "applications": [ "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP2304EA rollers smear even with correct grease.", "The NUP rib arrangement is not interchangeable with another prefix on the same 20 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 52×21 mm envelope matches.", "If the shaft must be located both ways, do not use NUP2304EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 20 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2304EA skids at 12,000 r/min and fails by smearing long before L10 fatigue.", "The 49.5/39 kN ratings, 4.75 kN Pu and 212 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2304EA?", "a": "NUP2304EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 21 mm width (0.787 × 2.047 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49.5 kN, C0 39 kN, Pu 4.75 kN, grease limiting speed 12,000 r/min, oil 16,800 r/min, mass about 212 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2304EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2304EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 16,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2304ea", "＊nup2304ea", "NUP2304EA" ], "locale_variants": {} }, { "sku": "NUP304EA", "brand": "NTN", "manufacturer_designation": "NTN NUP304EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 26.9, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP304EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 37.5 kN dynamic rating in the 20 mm bore. Numbering ties NUP304EA to its envelope: type code NUP, series NUP300, 20 mm bore; the 52×15 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 18,000 r/min with oil versus 13,000 r/min with grease (a 5,000 r/min band), lubrication choice for NUP304EA is a thermal decision, not just a sealing one. Selection arithmetic: Pu 3.25 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.72 (26.9/37.5 kN) shows the high-static-capacity proportioning of this 20 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP304EA.", "applications": [ "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 20 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP304EA rollers smear even with correct grease.", "Wide (22/23) and light (10/49) executions at 20 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 37.5/26.9 kN pair here belongs to NUP304EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "Grease limiting speed 13,000 r/min and oil 18,000 r/min are different limits for NUP304EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 37.5/26.9 kN ratings, 3.25 kN Pu and 147 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP304EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP304EA?", "a": "NUP304EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 20 mm bore, 52 mm OD and 15 mm width (0.787 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 37.5 kN, C0 26.9 kN, Pu 3.25 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 147 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP304EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP304EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP304EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 27.5 mm, Ew 45.5 mm. The nominal bore/OD remain 20/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP304EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup304ea", "＊nup304ea", "NUP304EA" ], "locale_variants": {} }, { "sku": "N1005", "brand": "NTN", "manufacturer_designation": "NTN N1005", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.7, "static_load_kN": 14.1, "fatigue_load_limit_kN": 1.72, "limiting_speed_rpm": 16000, "max_rpm": 16000, "speed_oil_rpm": 19000, "weight_g": 91, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 25 mm shaft NTN supplies N1005: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 16,000 r/min on grease and 19,000 r/min on oil. Numbering ties N1005 to its envelope: type code N, series N1000, 25 mm bore; the 47×12 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N1005 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 0.7 kN-per-mm-bore figure (16.7 kN over 25 mm) lets a N1005 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 25 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N1005 rollers smear even with correct grease.", "If the shaft must be located both ways, do not use N1005 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 12 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "If the shaft must be located both ways, do not use N1005 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace N1005 with a deep-groove ball bearing on rating alone: line contact gives 16.7 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 16.7/14.1 kN ratings, 1.72 kN Pu and 91 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1005 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1005?", "a": "N1005 is an NTN N single-row cylindrical roller bearing to ISO 15: 25 mm bore, 47 mm OD and 12 mm width (0.984 × 1.85 × 0.472 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16.7 kN, C0 14.1 kN, Pu 1.72 kN, grease limiting speed 16,000 r/min, oil 19,000 r/min, mass about 91 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1005 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1005 is supplied in the standard open execution shown in the table." }, { "q": "Can N1005 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1005?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 30.5 mm, Ew 41.5 mm. The nominal bore/OD remain 25/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 16,000 r/min grease / 19,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1005", "N1005" ], "locale_variants": {} }, { "sku": "NJ1005", "brand": "NTN", "manufacturer_designation": "NTN NJ1005", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.7, "static_load_kN": 14.1, "fatigue_load_limit_kN": 1.72, "limiting_speed_rpm": 16000, "max_rpm": 16000, "speed_oil_rpm": 19000, "weight_g": 91, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ1005 on the 25×47 mm envelope, 12 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 16,000 r/min. Digit by digit, NJ1005 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 25 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1005. The 25 mm (0.984 in) bore and 47 mm (1.85 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 12 mm-wide ring. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ1005 rollers smear even with correct grease.", "The NJ rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 47×12 mm envelope matches.", "The NJ rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 47×12 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "The 16.7/14.1 kN ratings, 1.72 kN Pu and 91 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1005 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1005?", "a": "NJ1005 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 25 mm bore, 47 mm OD and 12 mm width (0.984 × 1.85 × 0.472 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16.7 kN, C0 14.1 kN, Pu 1.72 kN, grease limiting speed 16,000 r/min, oil 19,000 r/min, mass about 91 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1005 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1005 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1005 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1005?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 30.5 mm, Ew 41.5 mm. The nominal bore/OD remain 25/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 16,000 r/min grease / 19,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1005", "NJ1005" ], "locale_variants": {} }, { "sku": "NN3005", "brand": "NTN", "manufacturer_designation": "NTN NN3005", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.6, "static_load_kN": 30, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 17000, "weight_g": 124, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN3005 denotes a 25×47×16 mm (0.984 × 1.85 × 0.63 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3005 floats or locates; the numeric remainder is the ISO 15 series and 25 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NN3005 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 3.65 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.05 (30/28.6 kN) shows the high-static-capacity proportioning of this 25 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 25 mm shaft.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NN3005 rollers smear even with correct grease.", "Grease limiting speed 14,000 r/min and oil 17,000 r/min are different limits for NN3005: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NN3005 with a deep-groove ball bearing on rating alone: line contact gives 28.6 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3005 skids at 14,000 r/min and fails by smearing long before L10 fatigue.", "Do not replace NN3005 with a deep-groove ball bearing on rating alone: line contact gives 28.6 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 28.6/30 kN ratings, 3.65 kN Pu and 124 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3005 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3005?", "a": "NN3005 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 25 mm bore, 47 mm OD and 16 mm width (0.984 × 1.85 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 28.6 kN, C0 30 kN, Pu 3.65 kN, grease limiting speed 14,000 r/min, oil 17,000 r/min, mass about 124 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3005 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3005 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3005?", "a": "NN3005 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN3005?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 41.329 mm. The nominal bore/OD remain 25/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 17,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3005", "NN3005" ], "locale_variants": {} }, { "sku": "NN3005K", "brand": "NTN", "manufacturer_designation": "NTN NN3005K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.6, "static_load_kN": 30, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 17000, "weight_g": 121, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3005K appears as a 25 mm bore single-row cylindrical roller bearing (28.6 kN C / 30 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Rating life at 28.6 kN C assumes clean oil and adequate film; the 3.65 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3005K non-locating position preloads the bearing when the shaft grows.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NN3005K rollers smear even with correct grease.", "The NN rib arrangement is not interchangeable with another prefix on the same 25 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 47×16 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 47 mm race brinells and releases as vibration within hours.", "The 16 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 28.6/30 kN pair here belongs to NN3005K as printed, not to the bare size.", "The 28.6/30 kN ratings, 3.65 kN Pu and 121 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3005K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3005K?", "a": "NN3005K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 25 mm bore, 47 mm OD and 16 mm width (0.984 × 1.85 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 28.6 kN, C0 30 kN, Pu 3.65 kN, grease limiting speed 14,000 r/min, oil 17,000 r/min, mass about 121 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3005K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3005K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3005K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3005K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3005 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN3005K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 41.329 mm. The nominal bore/OD remain 25/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 17,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3005K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3005k", "NN3005K" ], "locale_variants": {} }, { "sku": "NU1005-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU1005", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.7, "static_load_kN": 14.1, "fatigue_load_limit_kN": 1.72, "limiting_speed_rpm": 16000, "max_rpm": 16000, "speed_oil_rpm": 19000, "weight_g": 91, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU1005 denotes a 25×47×12 mm (0.984 × 1.85 × 0.472 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU1005 designation when purchasing. Rating life at 16.7 kN C assumes clean oil and adequate film; the 1.72 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1005 non-locating position preloads the bearing when the shaft grows.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU1005 rollers smear even with correct grease.", "Do not replace NU1005 with a deep-groove ball bearing on rating alone: line contact gives 16.7 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 12 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 12 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 16.7/14.1 kN ratings, 1.72 kN Pu and 91 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1005 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1005?", "a": "NU1005 is an NTN NU single-row cylindrical roller bearing to ISO 15: 25 mm bore, 47 mm OD and 12 mm width (0.984 × 1.85 × 0.472 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16.7 kN, C0 14.1 kN, Pu 1.72 kN, grease limiting speed 16,000 r/min, oil 19,000 r/min, mass about 91 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1005 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1005 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1005 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1005?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 30.5 mm, Ew 41.5 mm. The nominal bore/OD remain 25/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 16,000 r/min grease / 19,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1005", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1005", "NU1005", "NU1005-NTN" ], "locale_variants": {} }, { "sku": "NUP1005", "brand": "NTN", "manufacturer_designation": "NTN NUP1005", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.7, "static_load_kN": 14.1, "fatigue_load_limit_kN": 1.72, "limiting_speed_rpm": 16000, "max_rpm": 16000, "speed_oil_rpm": 19000, "weight_g": 91, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP1005 denotes a 25×47×12 mm (0.984 × 1.85 × 0.472 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1005 floats or locates; the numeric remainder is the ISO 15 series and 25 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP1005 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NUP1005 as a pure radial bearing: keep P below 16.7 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP1005 non-locating position preloads the bearing when the shaft grows.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP1005 rollers smear even with correct grease.", "The 11.0 mm section at 25 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 12 mm-wide cavity.", "The NUP rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 47×12 mm envelope matches.", "The 11.0 mm section at 25 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 12 mm-wide cavity.", "Do not replace NUP1005 with a deep-groove ball bearing on rating alone: line contact gives 16.7 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 16.7/14.1 kN ratings, 1.72 kN Pu and 91 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1005 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1005?", "a": "NUP1005 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 25 mm bore, 47 mm OD and 12 mm width (0.984 × 1.85 × 0.472 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16.7 kN, C0 14.1 kN, Pu 1.72 kN, grease limiting speed 16,000 r/min, oil 19,000 r/min, mass about 91 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1005 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1005 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1005 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1005?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 30.5 mm, Ew 41.5 mm. The nominal bore/OD remain 25/47 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 16,000 r/min grease / 19,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1005", "NUP1005" ], "locale_variants": {} }, { "sku": "N205EA", "brand": "NTN", "manufacturer_designation": "NTN N205EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.5, "static_load_kN": 27.7, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N205EA appears as a 25 mm bore single-row cylindrical roller bearing (34.5 kN C / 27.7 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). The 15 mm width and 13.5 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 25 mm (0.984 in) bore and 52 mm (2.047 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 15 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N205EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N205EA rollers smear even with correct grease.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N205EA skids at 13,000 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use N205EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use N205EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open N205EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "The 34.5/27.7 kN ratings, 3.4 kN Pu and 130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N205EA?", "a": "N205EA is an NTN N single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 15 mm width (0.984 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 27.7 kN, Pu 3.4 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N205EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N205EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n205ea", "＊n205ea", "N205EA" ], "locale_variants": {} }, { "sku": "N2205EA", "brand": "NTN", "manufacturer_designation": "NTN N2205EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.5, "static_load_kN": 34.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 163, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2205EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 25×52×18 mm ISO 15 envelope. On the NTN nameplate N states which ring carries the ribs, which determines whether N2205EA floats or locates; the numeric remainder is the ISO 15 series and 25 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N2205EA. Equivalent-load planning treats N2205EA as a pure radial bearing: keep P below 41.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N2205EA rollers smear even with correct grease.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "Grease limiting speed 11,000 r/min and oil 15,600 r/min are different limits for N2205EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open N2205EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "The 41.5/34.5 kN ratings, 4.25 kN Pu and 163 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2205EA?", "a": "N2205EA is an NTN N single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 41.5 kN, C0 34.5 kN, Pu 4.25 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 163 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2205EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2205EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2205ea", "＊n2205ea", "N2205EA" ], "locale_variants": {} }, { "sku": "NF205EA", "brand": "NTN", "manufacturer_designation": "NTN NF205EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.5, "static_load_kN": 27.7, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF205EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 25×52×15 mm ISO 15 envelope. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF205EA floats or locates; the numeric remainder is the ISO 15 series and 25 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF205EA. Mass 130 g for the 25×52×15 mm NF205EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 25 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF205EA rollers smear even with correct grease.", "The 13.5 mm section at 25 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 15 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF205EA skids at 13,000 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NF205EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "The 34.5/27.7 kN ratings, 3.4 kN Pu and 130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF205EA?", "a": "NF205EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 15 mm width (0.984 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 27.7 kN, Pu 3.4 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF205EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF205EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf205ea", "＊nf205ea", "NF205EA" ], "locale_variants": {} }, { "sku": "NF2205EA", "brand": "NTN", "manufacturer_designation": "NTN NF2205EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.5, "static_load_kN": 34.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 163, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2205EA is the wide (22) section of the NTN NF2200 dimension series for a 25 mm shaft — 41.5 kN of basic dynamic capacity in a 163 g, open bearing. Digit by digit, NF2205EA reads as NF (one rib on each ring), ISO 15 series, and bore 25 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 13.5 mm radial section ((52−25)/2) frames the roller complement; capacity per millimetre of bore is about 1.7 kN/mm before application factors. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 25 mm shaft.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF2205EA rollers smear even with correct grease.", "Grease limiting speed 11,000 r/min and oil 15,600 r/min are different limits for NF2205EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NF2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "The 13.5 mm section at 25 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "The 41.5/34.5 kN ratings, 4.25 kN Pu and 163 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2205EA?", "a": "NF2205EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 41.5 kN, C0 34.5 kN, Pu 4.25 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 163 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2205EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2205EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2205ea", "＊nf2205ea", "NF2205EA" ], "locale_variants": {} }, { "sku": "NJ205EA", "brand": "NTN", "manufacturer_designation": "NTN NJ205EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.5, "static_load_kN": 27.7, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ205EA denotes a 25×52×15 mm (0.984 × 2.047 × 0.591 in) cylindrical roller bearing in the NJ200 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ205EA floats or locates; the numeric remainder is the ISO 15 series and 25 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NJ205EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 13,000 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 18,000 r/min for continuously high-duty 25 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ205EA rollers smear even with correct grease.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 34.5/27.7 kN pair here belongs to NJ205EA as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ205EA skids at 13,000 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 13,000 r/min and oil 18,000 r/min are different limits for NJ205EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NJ205EA with a deep-groove ball bearing on rating alone: line contact gives 34.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 34.5/27.7 kN ratings, 3.4 kN Pu and 130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ205EA?", "a": "NJ205EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 15 mm width (0.984 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 27.7 kN, Pu 3.4 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ205EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ205EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj205ea", "＊nj205ea", "NJ205EA" ], "locale_variants": {} }, { "sku": "NJ2205EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2205EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.5, "static_load_kN": 34.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 163, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2205EA denotes a 25×52×18 mm (0.984 × 2.047 × 0.709 in) cylindrical roller bearing in the NJ2200 family, the EA high-capacity pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 31.5 mm and Ew 46.5 mm — the envelope inside the 25/52 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ2205EA rollers smear even with correct grease.", "Do not replace NJ2205EA with a deep-groove ball bearing on rating alone: line contact gives 41.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 52×18 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2205EA skids at 11,000 r/min and fails by smearing long before L10 fatigue.", "The NJ rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 52×18 mm envelope matches.", "The 41.5/34.5 kN ratings, 4.25 kN Pu and 163 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2205EA?", "a": "NJ2205EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 41.5 kN, C0 34.5 kN, Pu 4.25 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 163 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2205EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2205EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2205ea", "＊nj2205ea", "NJ2205EA" ], "locale_variants": {} }, { "sku": "NU205EA", "brand": "NTN", "manufacturer_designation": "NTN NU205EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.5, "static_load_kN": 27.7, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 25 mm shaft NTN supplies NU205EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 13,000 r/min on grease and 18,000 r/min on oil. Digit by digit, NU205EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 25 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 18,000 r/min with oil versus 13,000 r/min with grease (a 5,000 r/min band), lubrication choice for NU205EA is a thermal decision, not just a sealing one. Selection arithmetic: Pu 3.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.80 (27.7/34.5 kN) shows the high-static-capacity proportioning of this 25 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU205EA rollers smear even with correct grease.", "Grease limiting speed 13,000 r/min and oil 18,000 r/min are different limits for NU205EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "Do not replace NU205EA with a deep-groove ball bearing on rating alone: line contact gives 34.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 13,000 r/min and oil 18,000 r/min are different limits for NU205EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 34.5/27.7 kN ratings, 3.4 kN Pu and 130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU205EA?", "a": "NU205EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 15 mm width (0.984 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 27.7 kN, Pu 3.4 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU205EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU205EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu205ea", "＊nu205ea", "NU205EA" ], "locale_variants": {} }, { "sku": "NU2205EA", "brand": "NTN", "manufacturer_designation": "NTN NU2205EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.5, "static_load_kN": 34.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 163, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2205EA appears as a 25 mm bore single-row cylindrical roller bearing (41.5 kN C / 34.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 25 mm, with 52 mm OD and 18 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. The 25 mm (0.984 in) bore and 52 mm (2.047 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 18 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 25 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU2205EA rollers smear even with correct grease.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The NU rib arrangement is not interchangeable with another prefix on the same 25 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 52×18 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 41.5/34.5 kN pair here belongs to NU2205EA as printed, not to the bare size.", "The 41.5/34.5 kN ratings, 4.25 kN Pu and 163 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2205EA?", "a": "NU2205EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 41.5 kN, C0 34.5 kN, Pu 4.25 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 163 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2205EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2205EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2205ea", "＊nu2205ea", "NU2205EA" ], "locale_variants": {} }, { "sku": "NUP205EA", "brand": "NTN", "manufacturer_designation": "NTN NUP205EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.5, "static_load_kN": 27.7, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 13000, "max_rpm": 13000, "speed_oil_rpm": 18000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP205EA on the 25×52 mm envelope, 15 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 13,000 r/min. Numbering ties NUP205EA to its envelope: type code NUP, series NUP200, 25 mm bore; the 52×15 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP205EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP205EA rollers smear even with correct grease.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NUP205EA with a deep-groove ball bearing on rating alone: line contact gives 34.5 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 34.5/27.7 kN ratings, 3.4 kN Pu and 130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP205EA?", "a": "NUP205EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 15 mm width (0.984 × 2.047 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 27.7 kN, Pu 3.4 kN, grease limiting speed 13,000 r/min, oil 18,000 r/min, mass about 130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP205EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP205EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 13,000 r/min grease / 18,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup205ea", "＊nup205ea", "NUP205EA" ], "locale_variants": {} }, { "sku": "NUP2205EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2205EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.5, "static_load_kN": 34.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 163, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2205EA on the 25×52 mm envelope, 18 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 11,000 r/min. Digit by digit, NUP2205EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 25 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 18 mm width and 13.5 mm section put the NUP2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 163 g for the 25×52×18 mm NUP2205EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2205EA.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP2205EA rollers smear even with correct grease.", "The NUP rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 52×18 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 52 mm race brinells and releases as vibration within hours.", "The 13.5 mm section at 25 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "Open NUP2205EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "The 41.5/34.5 kN ratings, 4.25 kN Pu and 163 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2205EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2205EA?", "a": "NUP2205EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 41.5 kN, C0 34.5 kN, Pu 4.25 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 163 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2205EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2205EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2205EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 31.5 mm, Ew 46.5 mm. The nominal bore/OD remain 25/52 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2205EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2205ea", "＊nup2205ea", "NUP2205EA" ], "locale_variants": {} }, { "sku": "N2305EA", "brand": "NTN", "manufacturer_designation": "NTN N2305EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 67.5, "static_load_kN": 56, "fatigue_load_limit_kN": 6.85, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 345, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2305EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 67.5 kN dynamic rating in the 25 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full N2305EA designation when purchasing. Speed ratio check: limiting 9,700 r/min is .73 of the 13,200 r/min oil value for N2305EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2305EA.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N2305EA rollers smear even with correct grease.", "The N rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 62×24 mm envelope matches.", "Open N2305EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "Do not replace N2305EA with a deep-groove ball bearing on rating alone: line contact gives 67.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 67.5/56 kN ratings, 6.85 kN Pu and 345 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2305EA?", "a": "N2305EA is an NTN N single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 24 mm width (0.984 × 2.441 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 67.5 kN, C0 56 kN, Pu 6.85 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 345 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2305EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2305EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2305ea", "＊n2305ea", "N2305EA" ], "locale_variants": {} }, { "sku": "N305EA", "brand": "NTN", "manufacturer_designation": "NTN N305EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N305EA on the 25×62 mm envelope, 17 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 11,000 r/min. Numbering ties N305EA to its envelope: type code N, series N300, 25 mm bore; the 62×17 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 34 mm and Ew 54 mm — the envelope inside the 25/62 mm bore/OD where the rollers actually run. Rating life at 49 kN C assumes clean oil and adequate film; the 4.55 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N305EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N305EA rollers smear even with correct grease.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace N305EA with a deep-groove ball bearing on rating alone: line contact gives 49 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 17 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The N rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 62×17 mm envelope matches.", "The 49/37.5 kN ratings, 4.55 kN Pu and 242 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N305EA?", "a": "N305EA is an NTN N single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 17 mm width (0.984 × 2.441 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 242 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N305EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N305EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n305ea", "＊n305ea", "N305EA" ], "locale_variants": {} }, { "sku": "NF2305EA", "brand": "NTN", "manufacturer_designation": "NTN NF2305EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 67.5, "static_load_kN": 56, "fatigue_load_limit_kN": 6.85, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 345, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 25 mm shaft NTN supplies NF2305EA: one integral rib on each ring; the open execution is rated 9,700 r/min on grease and 13,200 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 25 mm, with 62 mm OD and 24 mm width from the ISO 15 general plan. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NF2305EA designation when purchasing. Speed ratio check: limiting 9,700 r/min is .73 of the 13,200 r/min oil value for NF2305EA; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 25 mm shaft.", "applications": [ "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF2305EA rollers smear even with correct grease.", "Open NF2305EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "The 18.5 mm section at 25 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 24 mm-wide cavity.", "The NF rib arrangement is not interchangeable with another prefix on the same 25 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 62×24 mm envelope matches.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 67.5/56 kN ratings, 6.85 kN Pu and 345 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2305EA?", "a": "NF2305EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 24 mm width (0.984 × 2.441 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 67.5 kN, C0 56 kN, Pu 6.85 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 345 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2305EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2305EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2305ea", "＊nf2305ea", "NF2305EA" ], "locale_variants": {} }, { "sku": "NF305EA", "brand": "NTN", "manufacturer_designation": "NTN NF305EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF305EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 49 kN dynamic rating in the 25 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NF305EA designation when purchasing. Selection arithmetic: Pu 4.55 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.77 (37.5/49 kN) shows the high-static-capacity proportioning of this 25 mm bore. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF305EA rollers smear even with correct grease.", "Open NF305EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 17 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 17 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 49/37.5 kN ratings, 4.55 kN Pu and 242 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF305EA?", "a": "NF305EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 17 mm width (0.984 × 2.441 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 242 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF305EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF305EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf305ea", "＊nf305ea", "NF305EA" ], "locale_variants": {} }, { "sku": "NJ2305EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2305EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 67.5, "static_load_kN": 56, "fatigue_load_limit_kN": 6.85, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 345, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 25 mm shaft NTN supplies NJ2305EA: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 9,700 r/min on grease and 13,200 r/min on oil. Digit by digit, NJ2305EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 25 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2305EA. The 2.7 kN-per-mm-bore figure (67.5 kN over 25 mm) lets a NJ2305EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2305EA.", "applications": [ "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ2305EA rollers smear even with correct grease.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The 18.5 mm section at 25 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 24 mm-wide cavity.", "Grease limiting speed 9,700 r/min and oil 13,200 r/min are different limits for NJ2305EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 62 mm race brinells and releases as vibration within hours.", "The 67.5/56 kN ratings, 6.85 kN Pu and 345 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2305EA?", "a": "NJ2305EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 24 mm width (0.984 × 2.441 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 67.5 kN, C0 56 kN, Pu 6.85 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 345 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2305EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2305EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2305ea", "＊nj2305ea", "NJ2305EA" ], "locale_variants": {} }, { "sku": "NJ305EA", "brand": "NTN", "manufacturer_designation": "NTN NJ305EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 25 mm shaft NTN supplies NJ305EA: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 11,000 r/min on grease and 15,600 r/min on oil. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). The 17 mm width and 18.5 mm section put the NJ300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 49 kN C assumes clean oil and adequate film; the 4.55 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ305EA.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ305EA rollers smear even with correct grease.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 49/37.5 kN pair here belongs to NJ305EA as printed, not to the bare size.", "Open NJ305EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "The 49/37.5 kN ratings, 4.55 kN Pu and 242 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ305EA?", "a": "NJ305EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 17 mm width (0.984 × 2.441 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 242 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ305EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ305EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj305ea", "＊nj305ea", "NJ305EA" ], "locale_variants": {} }, { "sku": "NU2305EA", "brand": "NTN", "manufacturer_designation": "NTN NU2305EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 67.5, "static_load_kN": 56, "fatigue_load_limit_kN": 6.85, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 345, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2305EA is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 25×62×24 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2305EA floats or locates; the numeric remainder is the ISO 15 series and 25 mm bore reference, not a fit or clearance instruction. At 13,200 r/min with oil versus 9,700 r/min with grease (a 3,500 r/min band), lubrication choice for NU2305EA is a thermal decision, not just a sealing one. Equivalent-load planning treats NU2305EA as a pure radial bearing: keep P below 67.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 25 mm shaft.", "applications": [ "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU2305EA rollers smear even with correct grease.", "The NU rib arrangement is not interchangeable with another prefix on the same 25 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 62×24 mm envelope matches.", "Grease limiting speed 9,700 r/min and oil 13,200 r/min are different limits for NU2305EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2305EA skids at 9,700 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 9,700 r/min and oil 13,200 r/min are different limits for NU2305EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 67.5/56 kN ratings, 6.85 kN Pu and 345 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2305EA?", "a": "NU2305EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 24 mm width (0.984 × 2.441 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 67.5 kN, C0 56 kN, Pu 6.85 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 345 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2305EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2305EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2305ea", "＊nu2305ea", "NU2305EA" ], "locale_variants": {} }, { "sku": "NU305EA", "brand": "NTN", "manufacturer_designation": "NTN NU305EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU305EA is the standard section of the NTN NU300 dimension series for a 25 mm shaft — 49 kN of basic dynamic capacity in a 242 g, open bearing. Numbering ties NU305EA to its envelope: type code NU, series NU300, 25 mm bore; the 62×17 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 49 kN and C0 37.5 kN (C0/C ≈ 0.77) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 11,000 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 15,600 r/min for continuously high-duty 25 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU305EA.", "applications": [ "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU305EA rollers smear even with correct grease.", "The 18.5 mm section at 25 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 17 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 49/37.5 kN pair here belongs to NU305EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use NU305EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU305EA skids at 11,000 r/min and fails by smearing long before L10 fatigue.", "The 49/37.5 kN ratings, 4.55 kN Pu and 242 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU305EA?", "a": "NU305EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 17 mm width (0.984 × 2.441 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 242 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU305EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU305EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu305ea", "＊nu305ea", "NU305EA" ], "locale_variants": {} }, { "sku": "NUP2305EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2305EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 67.5, "static_load_kN": 56, "fatigue_load_limit_kN": 6.85, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 345, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2305EA appears as a 25 mm bore single-row cylindrical roller bearing (67.5 kN C / 56 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP2305EA to its envelope: type code NUP, series NUP2300, 25 mm bore; the 62×24 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NUP2305EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 6.85 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.83 (56/67.5 kN) shows the high-static-capacity proportioning of this 25 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP2305EA; an oversized radius locks the ring on its face and tilts the 24 mm-wide seat.", "applications": [ "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP2305EA rollers smear even with correct grease.", "Grease limiting speed 9,700 r/min and oil 13,200 r/min are different limits for NUP2305EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 67.5/56 kN pair here belongs to NUP2305EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 67.5/56 kN ratings, 6.85 kN Pu and 345 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2305EA?", "a": "NUP2305EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 24 mm width (0.984 × 2.441 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 67.5 kN, C0 56 kN, Pu 6.85 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 345 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2305EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2305EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2305ea", "＊nup2305ea", "NUP2305EA" ], "locale_variants": {} }, { "sku": "NUP305EA", "brand": "NTN", "manufacturer_designation": "NTN NUP305EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP305EA appears as a 25 mm bore single-row cylindrical roller bearing (49 kN C / 37.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 25 mm, with 62 mm OD and 17 mm width from the ISO 15 general plan. The 17 mm width and 18.5 mm section put the NUP300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 2.0 kN-per-mm-bore figure (49 kN over 25 mm) lets a NUP305EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP305EA.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP305EA rollers smear even with correct grease.", "Do not replace NUP305EA with a deep-groove ball bearing on rating alone: line contact gives 49 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 17 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "Open NUP305EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "Open NUP305EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "The 49/37.5 kN ratings, 4.55 kN Pu and 242 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP305EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP305EA?", "a": "NUP305EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 25 mm bore, 62 mm OD and 17 mm width (0.984 × 2.441 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 49 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 242 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP305EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP305EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP305EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 34 mm, Ew 54 mm. The nominal bore/OD remain 25/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP305EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup305ea", "＊nup305ea", "NUP305EA" ], "locale_variants": {} }, { "sku": "N405", "brand": "NTN", "manufacturer_designation": "NTN N405", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51.5, "static_load_kN": 40, "fatigue_load_limit_kN": 4.85, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N405 on the 25×80 mm envelope, 21 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 8,500 r/min. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 25 mm (00–03 use the 10/12/15/17 exception table). With C 51.5 kN and C0 40 kN (C0/C ≈ 0.78) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 25 mm (0.984 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 21 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of N405; an oversized radius locks the ring on its face and tilts the 21 mm-wide seat.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the N405 rollers smear even with correct grease.", "The 27.5 mm section at 25 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 21 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N405 skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "The 51.5/40 kN ratings, 4.85 kN Pu and 536 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N405 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N405?", "a": "N405 is an NTN N single-row cylindrical roller bearing to ISO 15: 25 mm bore, 80 mm OD and 21 mm width (0.984 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51.5 kN, C0 40 kN, Pu 4.85 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 536 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N405 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N405 is supplied in the standard open execution shown in the table." }, { "q": "Can N405 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N405?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 38.8 mm, Ew 62.8 mm. The nominal bore/OD remain 25/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N405", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n405", "N405" ], "locale_variants": {} }, { "sku": "NF405", "brand": "NTN", "manufacturer_designation": "NTN NF405", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51.5, "static_load_kN": 40, "fatigue_load_limit_kN": 4.85, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF405 denotes a 25×80×21 mm (0.984 × 3.15 × 0.827 in) cylindrical roller bearing in the NF400 family, a pressed sheet-steel cage. Numbering ties NF405 to its envelope: type code NF, series NF400, 25 mm bore; the 80×21 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 10,000 r/min for continuously high-duty 25 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF405 non-locating position preloads the bearing when the shaft grows.", "applications": [ "agricultural PTO and implement gear shafts", "small conveyor and fan rotor positions", "small electric-motor armature shafts", "light gearbox layshaft and pinion positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF405 rollers smear even with correct grease.", "Grease limiting speed 8,500 r/min and oil 10,000 r/min are different limits for NF405: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NF400 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NF405 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 51.5/40 kN pair here belongs to NF405 as printed, not to the bare size.", "The 51.5/40 kN ratings, 4.85 kN Pu and 536 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF405 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF405?", "a": "NF405 is an NTN NF single-row cylindrical roller bearing to ISO 15: 25 mm bore, 80 mm OD and 21 mm width (0.984 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51.5 kN, C0 40 kN, Pu 4.85 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 536 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF405 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF405 is supplied in the standard open execution shown in the table." }, { "q": "Can NF405 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF405?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 38.8 mm, Ew 62.8 mm. The nominal bore/OD remain 25/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF405", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf405", "NF405" ], "locale_variants": {} }, { "sku": "NJ405", "brand": "NTN", "manufacturer_designation": "NTN NJ405", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51.5, "static_load_kN": 40, "fatigue_load_limit_kN": 4.85, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 25 mm shaft NTN supplies NJ405: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 8,500 r/min on grease and 10,000 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 25 mm, with 80 mm OD and 21 mm width from the ISO 15 general plan. With C 51.5 kN and C0 40 kN (C0/C ≈ 0.78) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 10,000 r/min for continuously high-duty 25 mm positions. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 25 mm shaft.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NJ405 rollers smear even with correct grease.", "If the shaft must be located both ways, do not use NJ405 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NJ405 with a deep-groove ball bearing on rating alone: line contact gives 51.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 80×21 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ405 skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "The 51.5/40 kN ratings, 4.85 kN Pu and 536 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ405 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ405?", "a": "NJ405 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 25 mm bore, 80 mm OD and 21 mm width (0.984 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51.5 kN, C0 40 kN, Pu 4.85 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 536 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ405 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ405 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ405 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ405?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 38.8 mm, Ew 62.8 mm. The nominal bore/OD remain 25/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ405", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj405", "NJ405" ], "locale_variants": {} }, { "sku": "NU405", "brand": "NTN", "manufacturer_designation": "NTN NU405", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51.5, "static_load_kN": 40, "fatigue_load_limit_kN": 4.85, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU405 is the heavy (04) section of the NTN NU400 dimension series for a 25 mm shaft — 51.5 kN of basic dynamic capacity in a 536 g, open bearing. Digit by digit, NU405 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 25 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 38.8 mm and Ew 62.8 mm — the envelope inside the 25/80 mm bore/OD where the rollers actually run. The 25 mm (0.984 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 21 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU405; an oversized radius locks the ring on its face and tilts the 21 mm-wide seat.", "applications": [ "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts", "appliance and office-machine drives", "agricultural PTO and implement gear shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NU405 rollers smear even with correct grease.", "Open NU405 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 25 mm contact.", "Do not replace NU405 with a deep-groove ball bearing on rating alone: line contact gives 51.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 25 mm inner ring.", "The NU rib arrangement is not interchangeable with another prefix on the same 25 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 80×21 mm envelope matches.", "The 51.5/40 kN ratings, 4.85 kN Pu and 536 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU405 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU405?", "a": "NU405 is an NTN NU single-row cylindrical roller bearing to ISO 15: 25 mm bore, 80 mm OD and 21 mm width (0.984 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51.5 kN, C0 40 kN, Pu 4.85 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 536 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU405 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU405 is supplied in the standard open execution shown in the table." }, { "q": "Can NU405 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU405?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 38.8 mm, Ew 62.8 mm. The nominal bore/OD remain 25/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU405", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu405", "NU405" ], "locale_variants": {} }, { "sku": "NUP405", "brand": "NTN", "manufacturer_designation": "NTN NUP405", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51.5, "static_load_kN": 40, "fatigue_load_limit_kN": 4.85, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP405 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 25×80×21 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 25 mm, with 80 mm OD and 21 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 38.8 mm and Ew 62.8 mm — the envelope inside the 25/80 mm bore/OD where the rollers actually run. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 10,000 r/min for continuously high-duty 25 mm positions. Heat the inner ring to max 120 °C for the 25 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "small electric-motor armature shafts", "light gearbox layshaft and pinion positions", "two-wheeler and small-engine transmission shafts", "small pump and compressor rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NUP405 rollers smear even with correct grease.", "The NUP rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 80×21 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 51.5/40 kN pair here belongs to NUP405 as printed, not to the bare size.", "The NUP rib arrangement is not interchangeable with another prefix on the same 25 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 80×21 mm envelope matches.", "The 51.5/40 kN ratings, 4.85 kN Pu and 536 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP405 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP405?", "a": "NUP405 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 25 mm bore, 80 mm OD and 21 mm width (0.984 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51.5 kN, C0 40 kN, Pu 4.85 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 536 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP405 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP405 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP405 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP405?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 38.8 mm, Ew 62.8 mm. The nominal bore/OD remain 25/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP405", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup405", "NUP405" ], "locale_variants": {} }, { "sku": "N1006", "brand": "NTN", "manufacturer_designation": "NTN N1006", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 2.39, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 16000, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N1006 denotes a 30×55×13 mm (1.181 × 2.165 × 0.512 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 30 mm (00–03 use the 10/12/15/17 exception table). With C 21.8 kN and C0 19.6 kN (C0/C ≈ 0.90) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Selection arithmetic: Pu 2.39 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.90 (19.6/21.8 kN) shows the high-static-capacity proportioning of this 30 mm bore. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N1006.", "The N rib arrangement is not interchangeable with another prefix on the same 30 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 55×13 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 12.5 mm section at 30 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 13 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1006 skids at 14,000 r/min and fails by smearing long before L10 fatigue.", "The 21.8/19.6 kN ratings, 2.39 kN Pu and 128 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1006 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1006?", "a": "N1006 is an NTN N single-row cylindrical roller bearing to ISO 15: 30 mm bore, 55 mm OD and 13 mm width (1.181 × 2.165 × 0.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21.8 kN, C0 19.6 kN, Pu 2.39 kN, grease limiting speed 14,000 r/min, oil 16,000 r/min, mass about 128 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1006 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1006 is supplied in the standard open execution shown in the table." }, { "q": "Can N1006 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1006?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 36.5 mm, Ew 48.5 mm. The nominal bore/OD remain 30/55 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 16,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1006", "N1006" ], "locale_variants": {} }, { "sku": "NJ1006", "brand": "NTN", "manufacturer_designation": "NTN NJ1006", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 2.39, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 16000, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1006 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 30 mm shaft — 21.8 kN of basic dynamic capacity in a 128 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1006 floats or locates; the numeric remainder is the ISO 15 series and 30 mm bore reference, not a fit or clearance instruction. The 12.5 mm radial section ((55−30)/2) frames the roller complement; capacity per millimetre of bore is about 0.7 kN/mm before application factors. Speed ratio check: limiting 14,000 r/min is .88 of the 16,000 r/min oil value for NJ1006; grease-churn heating closes that gap as fill quantity rises. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 30 mm shaft.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ1006.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 21.8/19.6 kN pair here belongs to NJ1006 as printed, not to the bare size.", "Do not replace NJ1006 with a deep-groove ball bearing on rating alone: line contact gives 21.8 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NJ1006 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "The 12.5 mm section at 30 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 13 mm-wide cavity.", "The 21.8/19.6 kN ratings, 2.39 kN Pu and 128 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1006 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1006?", "a": "NJ1006 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 30 mm bore, 55 mm OD and 13 mm width (1.181 × 2.165 × 0.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21.8 kN, C0 19.6 kN, Pu 2.39 kN, grease limiting speed 14,000 r/min, oil 16,000 r/min, mass about 128 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1006 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1006 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1006 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1006?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 36.5 mm, Ew 48.5 mm. The nominal bore/OD remain 30/55 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 16,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1006", "NJ1006" ], "locale_variants": {} }, { "sku": "NN3006", "brand": "NTN", "manufacturer_designation": "NTN NN3006", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34, "static_load_kN": 37, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 199, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3006 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 34 kN dynamic rating in the 30 mm bore. Numbering ties NN3006 to its envelope: type code NN, series NN3000, 30 mm bore; the 55×19 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 34 kN and C0 37 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Rating life at 34 kN C assumes clean oil and adequate film; the 4.55 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3006.", "applications": [ "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3006.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 34/37 kN pair here belongs to NN3006 as printed, not to the bare size.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3006 does not substitute a precision-class execution.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3006 skids at 12,000 r/min and fails by smearing long before L10 fatigue.", "The 34/37 kN ratings, 4.55 kN Pu and 199 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3006 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3006?", "a": "NN3006 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 30 mm bore, 55 mm OD and 19 mm width (1.181 × 2.165 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34 kN, C0 37 kN, Pu 4.55 kN, grease limiting speed 12,000 r/min, oil 15,000 r/min, mass about 199 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3006 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3006 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3006?", "a": "NN3006 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN3006?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 48.535 mm. The nominal bore/OD remain 30/55 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 15,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3006", "NN3006" ], "locale_variants": {} }, { "sku": "NN3006K", "brand": "NTN", "manufacturer_designation": "NTN NN3006K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34, "static_load_kN": 37, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 193, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 30 mm shaft NTN supplies NN3006K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 12,000 r/min on grease and 15,000 r/min on oil. Digit by digit, NN3006K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 30 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 15,000 r/min with oil versus 12,000 r/min with grease (a 3,000 r/min band), lubrication choice for NN3006K is a thermal decision, not just a sealing one. Thermal planning around the 12,000 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 15,000 r/min for continuously high-duty 30 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3006K.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3006K.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3006K skids at 12,000 r/min and fails by smearing long before L10 fatigue.", "Do not replace NN3006K with a deep-groove ball bearing on rating alone: line contact gives 34 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 12,000 r/min and oil 15,000 r/min are different limits for NN3006K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 12,000 r/min and oil 15,000 r/min are different limits for NN3006K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 34/37 kN ratings, 4.55 kN Pu and 193 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3006K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3006K?", "a": "NN3006K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 30 mm bore, 55 mm OD and 19 mm width (1.181 × 2.165 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34 kN, C0 37 kN, Pu 4.55 kN, grease limiting speed 12,000 r/min, oil 15,000 r/min, mass about 193 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3006K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3006K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3006K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3006K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3006 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN3006K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 48.535 mm. The nominal bore/OD remain 30/55 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 15,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3006K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3006k", "NN3006K" ], "locale_variants": {} }, { "sku": "NU1006-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU1006", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 2.39, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 16000, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 30 mm shaft NTN supplies NU1006: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 14,000 r/min on grease and 16,000 r/min on oil. Digit by digit, NU1006 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 30 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 14,000 r/min grease and 16,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 30 mm bore. The 30 mm (1.181 in) bore and 55 mm (2.165 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 13 mm-wide ring. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU1006.", "The 13 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "The 13 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 55 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NU1006 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 21.8/19.6 kN ratings, 2.39 kN Pu and 128 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1006 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1006?", "a": "NU1006 is an NTN NU single-row cylindrical roller bearing to ISO 15: 30 mm bore, 55 mm OD and 13 mm width (1.181 × 2.165 × 0.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21.8 kN, C0 19.6 kN, Pu 2.39 kN, grease limiting speed 14,000 r/min, oil 16,000 r/min, mass about 128 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1006 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1006 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1006 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1006?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 36.5 mm, Ew 48.5 mm. The nominal bore/OD remain 30/55 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 16,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1006", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1006", "NU1006", "NU1006-NTN" ], "locale_variants": {} }, { "sku": "NUP1006", "brand": "NTN", "manufacturer_designation": "NTN NUP1006", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 2.39, "limiting_speed_rpm": 14000, "max_rpm": 14000, "speed_oil_rpm": 16000, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1006 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 21.8 kN dynamic rating in the 30 mm bore. Numbering ties NUP1006 to its envelope: type code NUP, series NUP1000, 30 mm bore; the 55×13 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 21.8 kN and C0 19.6 kN (C0/C ≈ 0.90) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Housing and shaft fillets must clear the ring chamfers of NUP1006; an oversized radius locks the ring on its face and tilts the 13 mm-wide seat.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP1006.", "Do not replace NUP1006 with a deep-groove ball bearing on rating alone: line contact gives 21.8 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NUP1006 with a deep-groove ball bearing on rating alone: line contact gives 21.8 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The NUP rib arrangement is not interchangeable with another prefix on the same 30 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 55×13 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1006 skids at 14,000 r/min and fails by smearing long before L10 fatigue.", "The 21.8/19.6 kN ratings, 2.39 kN Pu and 128 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1006 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1006?", "a": "NUP1006 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 30 mm bore, 55 mm OD and 13 mm width (1.181 × 2.165 × 0.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21.8 kN, C0 19.6 kN, Pu 2.39 kN, grease limiting speed 14,000 r/min, oil 16,000 r/min, mass about 128 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1006 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1006 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1006 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1006?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 36.5 mm, Ew 48.5 mm. The nominal bore/OD remain 30/55 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 14,000 r/min grease / 16,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1006", "NUP1006" ], "locale_variants": {} }, { "sku": "N206EA", "brand": "NTN", "manufacturer_designation": "NTN N206EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 46, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 205, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N206EA is the standard section of the NTN N200 dimension series for a 30 mm shaft — 46 kN of basic dynamic capacity in a 205 g, open bearing. Numbering ties N206EA to its envelope: type code N, series N200, 30 mm bore; the 62×16 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N206EA. Mass 205 g for the 30×62×16 mm N206EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N206EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N206EA.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 46/37.5 kN pair here belongs to N206EA as printed, not to the bare size.", "The 16.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 62 mm race brinells and releases as vibration within hours.", "The 46/37.5 kN ratings, 4.55 kN Pu and 205 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N206EA?", "a": "N206EA is an NTN N single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 16 mm width (1.181 × 2.441 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 46 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 205 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N206EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N206EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n206ea", "＊n206ea", "N206EA" ], "locale_variants": {} }, { "sku": "N2206EA", "brand": "NTN", "manufacturer_designation": "NTN N2206EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 259, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2206EA on the 30×62 mm envelope, 20 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 9,700 r/min. Digit by digit, N2206EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 30 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 58 kN and C0 50 kN (C0/C ≈ 0.86) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Thermal planning around the 9,700 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 13,200 r/min for continuously high-duty 30 mm positions. Housing and shaft fillets must clear the ring chamfers of N2206EA; an oversized radius locks the ring on its face and tilts the 20 mm-wide seat.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2206EA.", "Grease limiting speed 9,700 r/min and oil 13,200 r/min are different limits for N2206EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use N2206EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 20 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2206EA skids at 9,700 r/min and fails by smearing long before L10 fatigue.", "The 58/50 kN ratings, 6.1 kN Pu and 259 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2206EA?", "a": "N2206EA is an NTN N single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 58 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 259 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2206EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2206EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2206ea", "＊n2206ea", "N2206EA" ], "locale_variants": {} }, { "sku": "NF206EA", "brand": "NTN", "manufacturer_designation": "NTN NF206EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 46, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 205, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF206EA on the 30×62 mm envelope, 16 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 11,000 r/min. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 30 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF206EA.", "Open NF206EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "Do not replace NF206EA with a deep-groove ball bearing on rating alone: line contact gives 46 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 16.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 46/37.5 kN pair here belongs to NF206EA as printed, not to the bare size.", "The 46/37.5 kN ratings, 4.55 kN Pu and 205 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF206EA?", "a": "NF206EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 16 mm width (1.181 × 2.441 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 46 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 205 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF206EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF206EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf206ea", "＊nf206ea", "NF206EA" ], "locale_variants": {} }, { "sku": "NF2206EA", "brand": "NTN", "manufacturer_designation": "NTN NF2206EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 259, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF2206EA denotes a 30×62×20 mm (1.181 × 2.441 × 0.787 in) cylindrical roller bearing in the NF2200 family, the EA high-capacity pressed sheet-steel cage. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 30 mm, with 62 mm OD and 20 mm width from the ISO 15 general plan. The 20 mm width and 16.0 mm section put the NF2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 30 mm (1.181 in) bore and 62 mm (2.441 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 20 mm-wide ring. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2206EA.", "Open NF2206EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "The NF rib arrangement is not interchangeable with another prefix on the same 30 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 62×20 mm envelope matches.", "Grease limiting speed 9,700 r/min and oil 13,200 r/min are different limits for NF2206EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NF2206EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "The 58/50 kN ratings, 6.1 kN Pu and 259 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2206EA?", "a": "NF2206EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 58 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 259 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2206EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2206EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2206ea", "＊nf2206ea", "NF2206EA" ], "locale_variants": {} }, { "sku": "NJ206EA", "brand": "NTN", "manufacturer_designation": "NTN NJ206EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 46, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 205, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ206EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 30×62×16 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 30 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ206EA designation when purchasing. Selection arithmetic: Pu 4.55 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.82 (37.5/46 kN) shows the high-static-capacity proportioning of this 30 mm bore. Housing and shaft fillets must clear the ring chamfers of NJ206EA; an oversized radius locks the ring on its face and tilts the 16 mm-wide seat.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ206EA.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NJ206EA with a deep-groove ball bearing on rating alone: line contact gives 46 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 16 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "The 46/37.5 kN ratings, 4.55 kN Pu and 205 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ206EA?", "a": "NJ206EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 16 mm width (1.181 × 2.441 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 46 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 205 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ206EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ206EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj206ea", "＊nj206ea", "NJ206EA" ], "locale_variants": {} }, { "sku": "NJ2206EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2206EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 259, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2206EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 30×62×20 mm ISO 15 envelope. Digit by digit, NJ2206EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 30 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 13,200 r/min with oil versus 9,700 r/min with grease (a 3,500 r/min band), lubrication choice for NJ2206EA is a thermal decision, not just a sealing one. Speed ratio check: limiting 9,700 r/min is .73 of the 13,200 r/min oil value for NJ2206EA; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ2206EA; an oversized radius locks the ring on its face and tilts the 20 mm-wide seat.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2206EA.", "The 20 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "Open NJ2206EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "The 16.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "Grease limiting speed 9,700 r/min and oil 13,200 r/min are different limits for NJ2206EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 58/50 kN ratings, 6.1 kN Pu and 259 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2206EA?", "a": "NJ2206EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 58 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 259 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2206EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2206EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2206ea", "＊nj2206ea", "NJ2206EA" ], "locale_variants": {} }, { "sku": "NU206EA", "brand": "NTN", "manufacturer_designation": "NTN NU206EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 46, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 205, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU206EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 46 kN dynamic rating in the 30 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 30 mm, with 62 mm OD and 16 mm width from the ISO 15 general plan. The 16.0 mm radial section ((62−30)/2) frames the roller complement; capacity per millimetre of bore is about 1.5 kN/mm before application factors. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Housing and shaft fillets must clear the ring chamfers of NU206EA; an oversized radius locks the ring on its face and tilts the 16 mm-wide seat.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU206EA.", "Open NU206EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 62 mm race brinells and releases as vibration within hours.", "The 16.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "The 46/37.5 kN ratings, 4.55 kN Pu and 205 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU206EA?", "a": "NU206EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 16 mm width (1.181 × 2.441 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 46 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 205 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU206EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU206EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu206ea", "＊nu206ea", "NU206EA" ], "locale_variants": {} }, { "sku": "NU2206EA", "brand": "NTN", "manufacturer_designation": "NTN NU2206EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 259, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2206EA is the wide (22) section of the NTN NU2200 dimension series for a 30 mm shaft — 58 kN of basic dynamic capacity in a 259 g, open bearing. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2206EA floats or locates; the numeric remainder is the ISO 15 series and 30 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU2206EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 58 kN C assumes clean oil and adequate film; the 6.1 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2206EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2206EA.", "The NU rib arrangement is not interchangeable with another prefix on the same 30 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 62×20 mm envelope matches.", "The 16.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 58/50 kN pair here belongs to NU2206EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 58/50 kN ratings, 6.1 kN Pu and 259 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2206EA?", "a": "NU2206EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 58 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 259 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2206EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2206EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2206ea", "＊nu2206ea", "NU2206EA" ], "locale_variants": {} }, { "sku": "NUP206EA", "brand": "NTN", "manufacturer_designation": "NTN NUP206EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 46, "static_load_kN": 37.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 15600, "weight_g": 205, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 30 mm shaft NTN supplies NUP206EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 11,000 r/min on grease and 15,600 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP206EA floats or locates; the numeric remainder is the ISO 15 series and 30 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP206EA designation when purchasing. The 30 mm (1.181 in) bore and 62 mm (2.441 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 16 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP206EA; an oversized radius locks the ring on its face and tilts the 16 mm-wide seat.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP206EA.", "The 16 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "The NUP rib arrangement is not interchangeable with another prefix on the same 30 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 62×16 mm envelope matches.", "If the shaft must be located both ways, do not use NUP206EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 16 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "The 46/37.5 kN ratings, 4.55 kN Pu and 205 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP206EA?", "a": "NUP206EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 16 mm width (1.181 × 2.441 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 46 kN, C0 37.5 kN, Pu 4.55 kN, grease limiting speed 11,000 r/min, oil 15,600 r/min, mass about 205 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP206EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP206EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 15,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup206ea", "＊nup206ea", "NUP206EA" ], "locale_variants": {} }, { "sku": "NUP2206EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2206EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 13200, "weight_g": 259, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 30 mm shaft NTN supplies NUP2206EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 9,700 r/min on grease and 13,200 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 30 mm, with 62 mm OD and 20 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 9,700 r/min grease and 13,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 30 mm bore. Speed ratio check: limiting 9,700 r/min is .73 of the 13,200 r/min oil value for NUP2206EA; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 30 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2206EA.", "The 16.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NUP2206EA with a deep-groove ball bearing on rating alone: line contact gives 58 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NUP2206EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 58/50 kN ratings, 6.1 kN Pu and 259 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2206EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2206EA?", "a": "NUP2206EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 58 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,700 r/min, oil 13,200 r/min, mass about 259 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2206EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2206EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2206EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 37.5 mm, Ew 55.5 mm. The nominal bore/OD remain 30/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,700 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2206EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2206ea", "＊nup2206ea", "NUP2206EA" ], "locale_variants": {} }, { "sku": "N2306EA", "brand": "NTN", "manufacturer_designation": "NTN N2306EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 8300, "max_rpm": 8300, "speed_oil_rpm": 11600, "weight_g": 526, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2306EA appears as a 30 mm bore single-row cylindrical roller bearing (88 kN C / 77.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties N2306EA to its envelope: type code N, series N2300, 30 mm bore; the 72×27 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 40.5 mm and Ew 62.5 mm — the envelope inside the 30/72 mm bore/OD where the rollers actually run. Rating life at 88 kN C assumes clean oil and adequate film; the 9.45 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 30 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2306EA.", "The 21.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2306EA skids at 8,300 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "The N rib arrangement is not interchangeable with another prefix on the same 30 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 72×27 mm envelope matches.", "The 88/77.5 kN ratings, 9.45 kN Pu and 526 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2306EA?", "a": "N2306EA is an NTN N single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 27 mm width (1.181 × 2.835 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 88 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 8,300 r/min, oil 11,600 r/min, mass about 526 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2306EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2306EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,300 r/min grease / 11,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2306ea", "＊n2306ea", "N2306EA" ], "locale_variants": {} }, { "sku": "N306EA", "brand": "NTN", "manufacturer_designation": "NTN N306EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63, "static_load_kN": 50, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 9300, "max_rpm": 9300, "speed_oil_rpm": 13200, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 30 mm shaft NTN supplies N306EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 9,300 r/min on grease and 13,200 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 30 mm, with 72 mm OD and 19 mm width from the ISO 15 general plan. The 21.0 mm radial section ((72−30)/2) frames the roller complement; capacity per millimetre of bore is about 2.1 kN/mm before application factors. Selection arithmetic: Pu 6.15 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.79 (50/63 kN) shows the high-static-capacity proportioning of this 30 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N306EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N306EA.", "Do not replace N306EA with a deep-groove ball bearing on rating alone: line contact gives 63 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 9,300 r/min and oil 13,200 r/min are different limits for N306EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 21.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "The 63/50 kN ratings, 6.15 kN Pu and 353 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N306EA?", "a": "N306EA is an NTN N single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 19 mm width (1.181 × 2.835 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 63 kN, C0 50 kN, Pu 6.15 kN, grease limiting speed 9,300 r/min, oil 13,200 r/min, mass about 353 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N306EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N306EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,300 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n306ea", "＊n306ea", "N306EA" ], "locale_variants": {} }, { "sku": "NF2306EA", "brand": "NTN", "manufacturer_designation": "NTN NF2306EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 8300, "max_rpm": 8300, "speed_oil_rpm": 11600, "weight_g": 526, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2306EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 88 kN dynamic rating in the 30 mm bore. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF2306EA floats or locates; the numeric remainder is the ISO 15 series and 30 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 40.5 mm and Ew 62.5 mm — the envelope inside the 30/72 mm bore/OD where the rollers actually run. Equivalent-load planning treats NF2306EA as a pure radial bearing: keep P below 88 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2306EA.", "If the shaft must be located both ways, do not use NF2306EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 88/77.5 kN pair here belongs to NF2306EA as printed, not to the bare size.", "The NF rib arrangement is not interchangeable with another prefix on the same 30 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 72×27 mm envelope matches.", "The 88/77.5 kN ratings, 9.45 kN Pu and 526 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2306EA?", "a": "NF2306EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 27 mm width (1.181 × 2.835 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 88 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 8,300 r/min, oil 11,600 r/min, mass about 526 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2306EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2306EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,300 r/min grease / 11,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2306ea", "＊nf2306ea", "NF2306EA" ], "locale_variants": {} }, { "sku": "NF306EA", "brand": "NTN", "manufacturer_designation": "NTN NF306EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63, "static_load_kN": 50, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 9300, "max_rpm": 9300, "speed_oil_rpm": 13200, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF306EA is the standard section of the NTN NF300 dimension series for a 30 mm shaft — 63 kN of basic dynamic capacity in a 353 g, open bearing. Numbering ties NF306EA to its envelope: type code NF, series NF300, 30 mm bore; the 72×19 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 9,300 r/min grease and 13,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 30 mm bore. Speed ratio check: limiting 9,300 r/min is .70 of the 13,200 r/min oil value for NF306EA; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF306EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "Open NF306EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NF306EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 63/50 kN ratings, 6.15 kN Pu and 353 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF306EA?", "a": "NF306EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 19 mm width (1.181 × 2.835 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 63 kN, C0 50 kN, Pu 6.15 kN, grease limiting speed 9,300 r/min, oil 13,200 r/min, mass about 353 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF306EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF306EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,300 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf306ea", "＊nf306ea", "NF306EA" ], "locale_variants": {} }, { "sku": "NJ2306EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2306EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 8300, "max_rpm": 8300, "speed_oil_rpm": 11600, "weight_g": 526, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2306EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 88 kN dynamic rating in the 30 mm bore. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 30 mm, with 72 mm OD and 27 mm width from the ISO 15 general plan. With C 88 kN and C0 77.5 kN (C0/C ≈ 0.88) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Equivalent-load planning treats NJ2306EA as a pure radial bearing: keep P below 88 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 30 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2306EA.", "Grease limiting speed 8,300 r/min and oil 11,600 r/min are different limits for NJ2306EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2306EA skids at 8,300 r/min and fails by smearing long before L10 fatigue.", "The 88/77.5 kN ratings, 9.45 kN Pu and 526 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2306EA?", "a": "NJ2306EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 27 mm width (1.181 × 2.835 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 88 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 8,300 r/min, oil 11,600 r/min, mass about 526 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2306EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2306EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,300 r/min grease / 11,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2306ea", "＊nj2306ea", "NJ2306EA" ], "locale_variants": {} }, { "sku": "NJ306EA", "brand": "NTN", "manufacturer_designation": "NTN NJ306EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63, "static_load_kN": 50, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 9300, "max_rpm": 9300, "speed_oil_rpm": 13200, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ306EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 63 kN dynamic rating in the 30 mm bore. Digit by digit, NJ306EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 30 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 9,300 r/min grease and 13,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 30 mm bore. Thermal planning around the 9,300 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 13,200 r/min for continuously high-duty 30 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 30 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ306EA.", "Do not replace NJ306EA with a deep-groove ball bearing on rating alone: line contact gives 63 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 30 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 72×19 mm envelope matches.", "Open NJ306EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "If the shaft must be located both ways, do not use NJ306EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 63/50 kN ratings, 6.15 kN Pu and 353 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ306EA?", "a": "NJ306EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 19 mm width (1.181 × 2.835 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 63 kN, C0 50 kN, Pu 6.15 kN, grease limiting speed 9,300 r/min, oil 13,200 r/min, mass about 353 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ306EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ306EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,300 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj306ea", "＊nj306ea", "NJ306EA" ], "locale_variants": {} }, { "sku": "NU2306EA", "brand": "NTN", "manufacturer_designation": "NTN NU2306EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 8300, "max_rpm": 8300, "speed_oil_rpm": 11600, "weight_g": 526, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2306EA on the 30×72 mm envelope, 27 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 8,300 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 30 mm (00–03 use the 10/12/15/17 exception table). The 21.0 mm radial section ((72−30)/2) frames the roller complement; capacity per millimetre of bore is about 2.9 kN/mm before application factors. The 30 mm (1.181 in) bore and 72 mm (2.835 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 27 mm-wide ring. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2306EA.", "Grease limiting speed 8,300 r/min and oil 11,600 r/min are different limits for NU2306EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NU2306EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 21.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "The 21.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "The 88/77.5 kN ratings, 9.45 kN Pu and 526 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2306EA?", "a": "NU2306EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 27 mm width (1.181 × 2.835 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 88 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 8,300 r/min, oil 11,600 r/min, mass about 526 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2306EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2306EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,300 r/min grease / 11,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2306ea", "＊nu2306ea", "NU2306EA" ], "locale_variants": {} }, { "sku": "NU306EA", "brand": "NTN", "manufacturer_designation": "NTN NU306EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63, "static_load_kN": 50, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 9300, "max_rpm": 9300, "speed_oil_rpm": 13200, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU306EA is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 30×72×19 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU306EA floats or locates; the numeric remainder is the ISO 15 series and 30 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU306EA designation when purchasing. The 2.1 kN-per-mm-bore figure (63 kN over 30 mm) lets a NU306EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU306EA; an oversized radius locks the ring on its face and tilts the 19 mm-wide seat.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU306EA.", "If the shaft must be located both ways, do not use NU306EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 21.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 30 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 72×19 mm envelope matches.", "The 19 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "The 63/50 kN ratings, 6.15 kN Pu and 353 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU306EA?", "a": "NU306EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 19 mm width (1.181 × 2.835 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 63 kN, C0 50 kN, Pu 6.15 kN, grease limiting speed 9,300 r/min, oil 13,200 r/min, mass about 353 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU306EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU306EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,300 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu306ea", "＊nu306ea", "NU306EA" ], "locale_variants": {} }, { "sku": "NUP2306EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2306EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 8300, "max_rpm": 8300, "speed_oil_rpm": 11600, "weight_g": 526, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2306EA is the extra-wide (23) section of the NTN NUP2300 dimension series for a 30 mm shaft — 88 kN of basic dynamic capacity in a 526 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2306EA floats or locates; the numeric remainder is the ISO 15 series and 30 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2306EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 30 mm shaft.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2306EA.", "Open NUP2306EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "The 27 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "If the shaft must be located both ways, do not use NUP2306EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NUP2306EA with a deep-groove ball bearing on rating alone: line contact gives 88 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 88/77.5 kN ratings, 9.45 kN Pu and 526 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2306EA?", "a": "NUP2306EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 27 mm width (1.181 × 2.835 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 88 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 8,300 r/min, oil 11,600 r/min, mass about 526 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2306EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2306EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,300 r/min grease / 11,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2306ea", "＊nup2306ea", "NUP2306EA" ], "locale_variants": {} }, { "sku": "NUP306EA", "brand": "NTN", "manufacturer_designation": "NTN NUP306EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63, "static_load_kN": 50, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 9300, "max_rpm": 9300, "speed_oil_rpm": 13200, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP306EA is the standard section of the NTN NUP300 dimension series for a 30 mm shaft — 63 kN of basic dynamic capacity in a 353 g, open bearing. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 30 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 9,300 r/min grease and 13,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 30 mm bore. Equivalent-load planning treats NUP306EA as a pure radial bearing: keep P below 63 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 30 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP306EA.", "The NUP rib arrangement is not interchangeable with another prefix on the same 30 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 72×19 mm envelope matches.", "The 21.0 mm section at 30 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "The 19 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "If the shaft must be located both ways, do not use NUP306EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 63/50 kN ratings, 6.15 kN Pu and 353 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP306EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP306EA?", "a": "NUP306EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 30 mm bore, 72 mm OD and 19 mm width (1.181 × 2.835 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 63 kN, C0 50 kN, Pu 6.15 kN, grease limiting speed 9,300 r/min, oil 13,200 r/min, mass about 353 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP306EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP306EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP306EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 40.5 mm, Ew 62.5 mm. The nominal bore/OD remain 30/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,300 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP306EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup306ea", "＊nup306ea", "NUP306EA" ], "locale_variants": {} }, { "sku": "N406", "brand": "NTN", "manufacturer_designation": "NTN N406", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69.5, "static_load_kN": 55, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 7300, "max_rpm": 7300, "speed_oil_rpm": 8500, "weight_g": 732, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N406 is the heavy (04) section of the NTN N400 dimension series for a 30 mm shaft — 69.5 kN of basic dynamic capacity in a 732 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 30 mm, with 90 mm OD and 23 mm width from the ISO 15 general plan. The 23 mm width and 30.0 mm section put the N400 series in the heavy (04) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 7,300 r/min is .86 of the 8,500 r/min oil value for N406; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N406.", "Do not replace N406 with a deep-groove ball bearing on rating alone: line contact gives 69.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open N406 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N406 skids at 7,300 r/min and fails by smearing long before L10 fatigue.", "Open N406 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "The 69.5/55 kN ratings, 6.7 kN Pu and 732 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N406 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N406?", "a": "N406 is an NTN N single-row cylindrical roller bearing to ISO 15: 30 mm bore, 90 mm OD and 23 mm width (1.181 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 69.5 kN, C0 55 kN, Pu 6.7 kN, grease limiting speed 7,300 r/min, oil 8,500 r/min, mass about 732 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N406 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N406 is supplied in the standard open execution shown in the table." }, { "q": "Can N406 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N406?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 45 mm, Ew 73 mm. The nominal bore/OD remain 30/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,300 r/min grease / 8,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N406", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n406", "N406" ], "locale_variants": {} }, { "sku": "NF406", "brand": "NTN", "manufacturer_designation": "NTN NF406", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69.5, "static_load_kN": 55, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 7300, "max_rpm": 7300, "speed_oil_rpm": 8500, "weight_g": 732, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF406 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 69.5 kN dynamic rating in the 30 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 30 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 7,300 r/min grease and 8,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 30 mm bore. The 30 mm (1.181 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NF406; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF406.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NF400 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF406 skids at 7,300 r/min and fails by smearing long before L10 fatigue.", "The 30.0 mm section at 30 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "If the shaft must be located both ways, do not use NF406 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 69.5/55 kN ratings, 6.7 kN Pu and 732 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF406 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF406?", "a": "NF406 is an NTN NF single-row cylindrical roller bearing to ISO 15: 30 mm bore, 90 mm OD and 23 mm width (1.181 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 69.5 kN, C0 55 kN, Pu 6.7 kN, grease limiting speed 7,300 r/min, oil 8,500 r/min, mass about 732 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF406 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF406 is supplied in the standard open execution shown in the table." }, { "q": "Can NF406 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF406?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 45 mm, Ew 73 mm. The nominal bore/OD remain 30/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,300 r/min grease / 8,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF406", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf406", "NF406" ], "locale_variants": {} }, { "sku": "NJ406", "brand": "NTN", "manufacturer_designation": "NTN NJ406", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69.5, "static_load_kN": 55, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 7300, "max_rpm": 7300, "speed_oil_rpm": 8500, "weight_g": 732, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ406 denotes a 30×90×23 mm (1.181 × 3.543 × 0.906 in) cylindrical roller bearing in the NJ400 family, a pressed sheet-steel cage. Digit by digit, NJ406 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 30 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 23 mm width and 30.0 mm section put the NJ400 series in the heavy (04) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 30 mm (1.181 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ406.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ406.", "The NJ rib arrangement is not interchangeable with another prefix on the same 30 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 69.5/55 kN pair here belongs to NJ406 as printed, not to the bare size.", "Do not replace NJ406 with a deep-groove ball bearing on rating alone: line contact gives 69.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NJ406 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "The 69.5/55 kN ratings, 6.7 kN Pu and 732 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ406 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ406?", "a": "NJ406 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 30 mm bore, 90 mm OD and 23 mm width (1.181 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 69.5 kN, C0 55 kN, Pu 6.7 kN, grease limiting speed 7,300 r/min, oil 8,500 r/min, mass about 732 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ406 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ406 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ406 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ406?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 45 mm, Ew 73 mm. The nominal bore/OD remain 30/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,300 r/min grease / 8,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ406-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj406", "NJ406" ], "locale_variants": {} }, { "sku": "NU406", "brand": "NTN", "manufacturer_designation": "NTN NU406", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69.5, "static_load_kN": 55, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 7300, "max_rpm": 7300, "speed_oil_rpm": 8500, "weight_g": 732, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 30 mm shaft NTN supplies NU406: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 7,300 r/min on grease and 8,500 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU406 floats or locates; the numeric remainder is the ISO 15 series and 30 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU406 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 7,300 r/min is .86 of the 8,500 r/min oil value for NU406; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 30 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU406.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 30 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 69.5/55 kN pair here belongs to NU406 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 69.5/55 kN ratings, 6.7 kN Pu and 732 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU406 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU406?", "a": "NU406 is an NTN NU single-row cylindrical roller bearing to ISO 15: 30 mm bore, 90 mm OD and 23 mm width (1.181 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 69.5 kN, C0 55 kN, Pu 6.7 kN, grease limiting speed 7,300 r/min, oil 8,500 r/min, mass about 732 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU406 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU406 is supplied in the standard open execution shown in the table." }, { "q": "Can NU406 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU406?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 45 mm, Ew 73 mm. The nominal bore/OD remain 30/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,300 r/min grease / 8,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU406-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu406", "NU406" ], "locale_variants": {} }, { "sku": "NUP406", "brand": "NTN", "manufacturer_designation": "NTN NUP406", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69.5, "static_load_kN": 55, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 7300, "max_rpm": 7300, "speed_oil_rpm": 8500, "weight_g": 732, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP406 appears as a 30 mm bore single-row cylindrical roller bearing (69.5 kN C / 55 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP406 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 30 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NUP406 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 30 mm (1.181 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 30 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP406.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 69.5/55 kN pair here belongs to NUP406 as printed, not to the bare size.", "Open NUP406 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 30 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 30 mm bore share bore but not OD/width; check the full NUP400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 69.5/55 kN ratings, 6.7 kN Pu and 732 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP406 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP406?", "a": "NUP406 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 30 mm bore, 90 mm OD and 23 mm width (1.181 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 69.5 kN, C0 55 kN, Pu 6.7 kN, grease limiting speed 7,300 r/min, oil 8,500 r/min, mass about 732 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP406 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP406 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP406 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP406?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 45 mm, Ew 73 mm. The nominal bore/OD remain 30/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,300 r/min grease / 8,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP406", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup406", "NUP406" ], "locale_variants": {} }, { "sku": "N1007", "brand": "NTN", "manufacturer_designation": "NTN N1007", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 176, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1007 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 25.1 kN dynamic rating in the 35 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 35 mm, with 62 mm OD and 14 mm width from the ISO 15 general plan. The 14 mm width and 13.5 mm section put the N1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 25.1 kN C assumes clean oil and adequate film; the 2.82 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 35 mm shaft.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N1007.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 25.1/23.2 kN pair here belongs to N1007 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1007 skids at 12,000 r/min and fails by smearing long before L10 fatigue.", "The N rib arrangement is not interchangeable with another prefix on the same 35 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 62×14 mm envelope matches.", "Open N1007 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 25.1/23.2 kN ratings, 2.82 kN Pu and 176 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1007 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1007?", "a": "N1007 is an NTN N single-row cylindrical roller bearing to ISO 15: 35 mm bore, 62 mm OD and 14 mm width (1.378 × 2.441 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 25.1 kN, C0 23.2 kN, Pu 2.82 kN, grease limiting speed 12,000 r/min, oil 15,000 r/min, mass about 176 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1007 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1007 is supplied in the standard open execution shown in the table." }, { "q": "Can N1007 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1007?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 42 mm, Ew 55 mm. The nominal bore/OD remain 35/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 15,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1007", "N1007" ], "locale_variants": {} }, { "sku": "NJ1007", "brand": "NTN", "manufacturer_designation": "NTN NJ1007", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 176, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 35 mm shaft NTN supplies NJ1007: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 12,000 r/min on grease and 15,000 r/min on oil. Numbering ties NJ1007 to its envelope: type code NJ, series NJ1000, 35 mm bore; the 62×14 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ1007 designation when purchasing. The 0.7 kN-per-mm-bore figure (25.1 kN over 35 mm) lets a NJ1007 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1007.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ1007.", "Open NJ1007 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 25.1/23.2 kN pair here belongs to NJ1007 as printed, not to the bare size.", "Grease limiting speed 12,000 r/min and oil 15,000 r/min are different limits for NJ1007: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 14 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 35 mm inner ring.", "The 25.1/23.2 kN ratings, 2.82 kN Pu and 176 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1007 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1007?", "a": "NJ1007 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 35 mm bore, 62 mm OD and 14 mm width (1.378 × 2.441 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 25.1 kN, C0 23.2 kN, Pu 2.82 kN, grease limiting speed 12,000 r/min, oil 15,000 r/min, mass about 176 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1007 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1007 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1007 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1007?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 42 mm, Ew 55 mm. The nominal bore/OD remain 35/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 15,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1007", "NJ1007" ], "locale_variants": {} }, { "sku": "NN3007", "brand": "NTN", "manufacturer_designation": "NTN NN3007", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 47.5, "fatigue_load_limit_kN": 5.8, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 13000, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3007 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 35×62×20 mm ISO 15 envelope. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 35 mm (00–03 use the 10/12/15/17 exception table). The 20 mm width and 13.5 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NN3007 as a pure radial bearing: keep P below 42 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3007 non-locating position preloads the bearing when the shaft grows.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3007.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3007 does not substitute a precision-class execution.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 62 mm race brinells and releases as vibration within hours.", "The 13.5 mm section at 35 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "Open NN3007 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 42/47.5 kN ratings, 5.8 kN Pu and 242 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3007 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3007?", "a": "NN3007 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 35 mm bore, 62 mm OD and 20 mm width (1.378 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 47.5 kN, Pu 5.8 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 242 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3007 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3007 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3007?", "a": "NN3007 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3007?", "a": "NTN rates NN3007 at 11,000 r/min with grease and 13,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3007", "NN3007" ], "locale_variants": {} }, { "sku": "NN3007K", "brand": "NTN", "manufacturer_designation": "NTN NN3007K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 47.5, "fatigue_load_limit_kN": 5.8, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 13000, "weight_g": 235, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3007K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 35×62×20 mm ISO 15 envelope. Numbering ties NN3007K to its envelope: type code NN, series NN3000, 35 mm bore; the 62×20 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 42 kN and C0 47.5 kN (C0/C ≈ 1.13) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Selection arithmetic: Pu 5.8 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.13 (47.5/42 kN) shows the high-static-capacity proportioning of this 35 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 35 mm shaft.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3007K.", "Grease limiting speed 11,000 r/min and oil 13,000 r/min are different limits for NN3007K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 13.5 mm section at 35 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "Open NN3007K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3007K skids at 11,000 r/min and fails by smearing long before L10 fatigue.", "The 42/47.5 kN ratings, 5.8 kN Pu and 235 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3007K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3007K?", "a": "NN3007K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 35 mm bore, 62 mm OD and 20 mm width (1.378 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 47.5 kN, Pu 5.8 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 235 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3007K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3007K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3007K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3007K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3007 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3007K?", "a": "NTN rates NN3007K at 11,000 r/min with grease and 13,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3007K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3007k", "NN3007K" ], "locale_variants": {} }, { "sku": "NU1007", "brand": "NTN", "manufacturer_designation": "NTN NU1007", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 176, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1007 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 35×62×14 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 35 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU1007 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 12,000 r/min is .80 of the 15,000 r/min oil value for NU1007; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1007 non-locating position preloads the bearing when the shaft grows.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU1007.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 62 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1007 skids at 12,000 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 12,000 r/min and oil 15,000 r/min are different limits for NU1007: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NU1007 with a deep-groove ball bearing on rating alone: line contact gives 25.1 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 25.1/23.2 kN ratings, 2.82 kN Pu and 176 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1007 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1007?", "a": "NU1007 is an NTN NU single-row cylindrical roller bearing to ISO 15: 35 mm bore, 62 mm OD and 14 mm width (1.378 × 2.441 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 25.1 kN, C0 23.2 kN, Pu 2.82 kN, grease limiting speed 12,000 r/min, oil 15,000 r/min, mass about 176 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1007 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1007 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1007 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1007?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 42 mm, Ew 55 mm. The nominal bore/OD remain 35/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 15,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1007-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1007", "NU1007" ], "locale_variants": {} }, { "sku": "NUP1007", "brand": "NTN", "manufacturer_designation": "NTN NUP1007", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 12000, "max_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 176, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1007 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 35×62×14 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 35 mm (00–03 use the 10/12/15/17 exception table). The 14 mm width and 13.5 mm section put the NUP1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 176 g for the 35×62×14 mm NUP1007 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 35 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP1007.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 62 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 25.1/23.2 kN pair here belongs to NUP1007 as printed, not to the bare size.", "Do not replace NUP1007 with a deep-groove ball bearing on rating alone: line contact gives 25.1 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Open NUP1007 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 25.1/23.2 kN ratings, 2.82 kN Pu and 176 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1007 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1007?", "a": "NUP1007 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 35 mm bore, 62 mm OD and 14 mm width (1.378 × 2.441 × 0.551 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 25.1 kN, C0 23.2 kN, Pu 2.82 kN, grease limiting speed 12,000 r/min, oil 15,000 r/min, mass about 176 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1007 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1007 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1007 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1007?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 42 mm, Ew 55 mm. The nominal bore/OD remain 35/62 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 12,000 r/min grease / 15,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1007", "NUP1007" ], "locale_variants": {} }, { "sku": "N207EA", "brand": "NTN", "manufacturer_designation": "NTN N207EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59.5, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9500, "max_rpm": 9500, "speed_oil_rpm": 13200, "weight_g": 294, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N207EA denotes a 35×72×17 mm (1.378 × 2.835 × 0.669 in) cylindrical roller bearing in the N200 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N207EA floats or locates; the numeric remainder is the ISO 15 series and 35 mm bore reference, not a fit or clearance instruction. With C 59.5 kN and C0 50 kN (C0/C ≈ 0.84) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Speed ratio check: limiting 9,500 r/min is .72 of the 13,200 r/min oil value for N207EA; grease-churn heating closes that gap as fill quantity rises. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N207EA.", "The 17 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 35 mm inner ring.", "The 17 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 35 mm inner ring.", "Do not replace N207EA with a deep-groove ball bearing on rating alone: line contact gives 59.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N207EA skids at 9,500 r/min and fails by smearing long before L10 fatigue.", "The 59.5/50 kN ratings, 6.1 kN Pu and 294 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N207EA?", "a": "N207EA is an NTN N single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 17 mm width (1.378 × 2.835 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 59.5 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,500 r/min, oil 13,200 r/min, mass about 294 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N207EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N207EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,500 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n207ea", "＊n207ea", "N207EA" ], "locale_variants": {} }, { "sku": "N2207EA", "brand": "NTN", "manufacturer_designation": "NTN N2207EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73, "static_load_kN": 65.5, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 405, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 35 mm shaft NTN supplies N2207EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 8,500 r/min on grease and 12,000 r/min on oil. Numbering ties N2207EA to its envelope: type code N, series N2200, 35 mm bore; the 72×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N2207EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 405 g for the 35×72×23 mm N2207EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of N2207EA; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2207EA.", "The 18.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 73/65.5 kN pair here belongs to N2207EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 73/65.5 kN ratings, 7.95 kN Pu and 405 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2207EA?", "a": "N2207EA is an NTN N single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 73 kN, C0 65.5 kN, Pu 7.95 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 405 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2207EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2207EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2207ea", "＊n2207ea", "N2207EA" ], "locale_variants": {} }, { "sku": "NF207EA", "brand": "NTN", "manufacturer_designation": "NTN NF207EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59.5, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9500, "max_rpm": 9500, "speed_oil_rpm": 13200, "weight_g": 294, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 35 mm shaft NTN supplies NF207EA: one integral rib on each ring; the open execution is rated 9,500 r/min on grease and 13,200 r/min on oil. Numbering ties NF207EA to its envelope: type code NF, series NF200, 35 mm bore; the 72×17 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NF207EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 35 mm (1.378 in) bore and 72 mm (2.835 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 17 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF207EA.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF207EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "Grease limiting speed 9,500 r/min and oil 13,200 r/min are different limits for NF207EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NF207EA with a deep-groove ball bearing on rating alone: line contact gives 59.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 59.5/50 kN ratings, 6.1 kN Pu and 294 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF207EA?", "a": "NF207EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 17 mm width (1.378 × 2.835 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 59.5 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,500 r/min, oil 13,200 r/min, mass about 294 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF207EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF207EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,500 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf207ea", "＊nf207ea", "NF207EA" ], "locale_variants": {} }, { "sku": "NF2207EA", "brand": "NTN", "manufacturer_designation": "NTN NF2207EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73, "static_load_kN": 65.5, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 405, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2207EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 35×72×23 mm ISO 15 envelope. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 35 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF2207EA. Mass 405 g for the 35×72×23 mm NF2207EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 35 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2207EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "Open NF2207EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 35 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "The 73/65.5 kN ratings, 7.95 kN Pu and 405 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2207EA?", "a": "NF2207EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 73 kN, C0 65.5 kN, Pu 7.95 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 405 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2207EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2207EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2207ea", "＊nf2207ea", "NF2207EA" ], "locale_variants": {} }, { "sku": "NJ207EA", "brand": "NTN", "manufacturer_designation": "NTN NJ207EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59.5, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9500, "max_rpm": 9500, "speed_oil_rpm": 13200, "weight_g": 294, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ207EA on the 35×72 mm envelope, 17 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 9,500 r/min. Numbering ties NJ207EA to its envelope: type code NJ, series NJ200, 35 mm bore; the 72×17 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 13,200 r/min with oil versus 9,500 r/min with grease (a 3,700 r/min band), lubrication choice for NJ207EA is a thermal decision, not just a sealing one. Speed ratio check: limiting 9,500 r/min is .72 of the 13,200 r/min oil value for NJ207EA; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ207EA; an oversized radius locks the ring on its face and tilts the 17 mm-wide seat.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ207EA.", "The 17 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 35 mm inner ring.", "Grease limiting speed 9,500 r/min and oil 13,200 r/min are different limits for NJ207EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ207EA skids at 9,500 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 9,500 r/min and oil 13,200 r/min are different limits for NJ207EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 59.5/50 kN ratings, 6.1 kN Pu and 294 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ207EA?", "a": "NJ207EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 17 mm width (1.378 × 2.835 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 59.5 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,500 r/min, oil 13,200 r/min, mass about 294 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ207EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ207EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,500 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj207ea", "＊nj207ea", "NJ207EA" ], "locale_variants": {} }, { "sku": "NJ2207EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2207EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73, "static_load_kN": 65.5, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 405, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2207EA on the 35×72 mm envelope, 23 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 8,500 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 35 mm, with 72 mm OD and 23 mm width from the ISO 15 general plan. The 23 mm width and 18.5 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 12,000 r/min for continuously high-duty 35 mm positions. Housing and shaft fillets must clear the ring chamfers of NJ2207EA; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2207EA.", "Grease limiting speed 8,500 r/min and oil 12,000 r/min are different limits for NJ2207EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2207EA skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "The NJ rib arrangement is not interchangeable with another prefix on the same 35 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 72×23 mm envelope matches.", "Open NJ2207EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 73/65.5 kN ratings, 7.95 kN Pu and 405 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2207EA?", "a": "NJ2207EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 73 kN, C0 65.5 kN, Pu 7.95 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 405 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2207EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2207EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2207ea", "＊nj2207ea", "NJ2207EA" ], "locale_variants": {} }, { "sku": "NU207EA", "brand": "NTN", "manufacturer_designation": "NTN NU207EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59.5, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9500, "max_rpm": 9500, "speed_oil_rpm": 13200, "weight_g": 294, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU207EA appears as a 35 mm bore single-row cylindrical roller bearing (59.5 kN C / 50 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU207EA floats or locates; the numeric remainder is the ISO 15 series and 35 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 9,500 r/min grease and 13,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 35 mm bore. Equivalent-load planning treats NU207EA as a pure radial bearing: keep P below 59.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU207EA; an oversized radius locks the ring on its face and tilts the 17 mm-wide seat.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU207EA.", "If the shaft must be located both ways, do not use NU207EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NU rib arrangement is not interchangeable with another prefix on the same 35 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 72×17 mm envelope matches.", "Open NU207EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "If the shaft must be located both ways, do not use NU207EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 59.5/50 kN ratings, 6.1 kN Pu and 294 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU207EA?", "a": "NU207EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 17 mm width (1.378 × 2.835 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 59.5 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,500 r/min, oil 13,200 r/min, mass about 294 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU207EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU207EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,500 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu207ea", "＊nu207ea", "NU207EA" ], "locale_variants": {} }, { "sku": "NU2207EA", "brand": "NTN", "manufacturer_designation": "NTN NU2207EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73, "static_load_kN": 65.5, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 405, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2207EA denotes a 35×72×23 mm (1.378 × 2.835 × 0.906 in) cylindrical roller bearing in the NU2200 family, the EA high-capacity pressed sheet-steel cage. Digit by digit, NU2207EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 35 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU2207EA designation when purchasing. The 2.1 kN-per-mm-bore figure (73 kN over 35 mm) lets a NU2207EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2207EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2207EA.", "The 18.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 72 mm race brinells and releases as vibration within hours.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 35 mm inner ring.", "The 73/65.5 kN ratings, 7.95 kN Pu and 405 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2207EA?", "a": "NU2207EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 73 kN, C0 65.5 kN, Pu 7.95 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 405 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2207EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2207EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2207ea", "＊nu2207ea", "NU2207EA" ], "locale_variants": {} }, { "sku": "NUP207EA", "brand": "NTN", "manufacturer_designation": "NTN NUP207EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59.5, "static_load_kN": 50, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 9500, "max_rpm": 9500, "speed_oil_rpm": 13200, "weight_g": 294, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP207EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 59.5 kN dynamic rating in the 35 mm bore. Digit by digit, NUP207EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 35 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 13,200 r/min with oil versus 9,500 r/min with grease (a 3,700 r/min band), lubrication choice for NUP207EA is a thermal decision, not just a sealing one. Mass 294 g for the 35×72×17 mm NUP207EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP207EA; an oversized radius locks the ring on its face and tilts the 17 mm-wide seat.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP207EA.", "Grease limiting speed 9,500 r/min and oil 13,200 r/min are different limits for NUP207EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NUP207EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 18.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 17 mm-wide cavity.", "Grease limiting speed 9,500 r/min and oil 13,200 r/min are different limits for NUP207EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 59.5/50 kN ratings, 6.1 kN Pu and 294 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP207EA?", "a": "NUP207EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 17 mm width (1.378 × 2.835 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 59.5 kN, C0 50 kN, Pu 6.1 kN, grease limiting speed 9,500 r/min, oil 13,200 r/min, mass about 294 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP207EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP207EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,500 r/min grease / 13,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup207ea", "＊nup207ea", "NUP207EA" ], "locale_variants": {} }, { "sku": "NUP2207EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2207EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73, "static_load_kN": 65.5, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 405, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2207EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 73 kN dynamic rating in the 35 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 35 mm (00–03 use the 10/12/15/17 exception table). With C 73 kN and C0 65.5 kN (C0/C ≈ 0.90) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 12,000 r/min for continuously high-duty 35 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 35 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2207EA.", "If the shaft must be located both ways, do not use NUP2207EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NUP rib arrangement is not interchangeable with another prefix on the same 35 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 72×23 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 73/65.5 kN pair here belongs to NUP2207EA as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2207EA skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "The 73/65.5 kN ratings, 7.95 kN Pu and 405 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2207EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2207EA?", "a": "NUP2207EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 73 kN, C0 65.5 kN, Pu 7.95 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 405 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2207EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2207EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2207EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 44 mm, Ew 64 mm. The nominal bore/OD remain 35/72 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2207EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2207ea", "＊nup2207ea", "NUP2207EA" ], "locale_variants": {} }, { "sku": "N2307EA", "brand": "NTN", "manufacturer_designation": "NTN N2307EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 109, "fatigue_load_limit_kN": 13.3, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 737, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2307EA is the extra-wide (23) section of the NTN N2300 dimension series for a 35 mm shaft — 117 kN of basic dynamic capacity in a 737 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N2307EA floats or locates; the numeric remainder is the ISO 15 series and 35 mm bore reference, not a fit or clearance instruction. The 22.5 mm radial section ((80−35)/2) frames the roller complement; capacity per millimetre of bore is about 3.3 kN/mm before application factors. The 3.3 kN-per-mm-bore figure (117 kN over 35 mm) lets a N2307EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 35 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2307EA.", "If the shaft must be located both ways, do not use N2307EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace N2307EA with a deep-groove ball bearing on rating alone: line contact gives 117 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open N2307EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 22.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "The 117/109 kN ratings, 13.3 kN Pu and 737 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2307EA?", "a": "N2307EA is an NTN N single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 31 mm width (1.378 × 3.15 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 109 kN, Pu 13.3 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 737 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2307EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2307EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2307ea", "＊n2307ea", "N2307EA" ], "locale_variants": {} }, { "sku": "N307EA", "brand": "NTN", "manufacturer_designation": "NTN N307EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 83.5, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 8100, "max_rpm": 8100, "speed_oil_rpm": 11500, "weight_g": 483, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N307EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 83.5 kN dynamic rating in the 35 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 35 mm (00–03 use the 10/12/15/17 exception table). The 21 mm width and 22.5 mm section put the N300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N307EA.", "The N rib arrangement is not interchangeable with another prefix on the same 35 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 80×21 mm envelope matches.", "If the shaft must be located both ways, do not use N307EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use N307EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open N307EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 83.5/71 kN ratings, 8.65 kN Pu and 483 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N307EA?", "a": "N307EA is an NTN N single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 21 mm width (1.378 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 8,100 r/min, oil 11,500 r/min, mass about 483 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N307EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N307EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,100 r/min grease / 11,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n307ea", "＊n307ea", "N307EA" ], "locale_variants": {} }, { "sku": "NF2307EA", "brand": "NTN", "manufacturer_designation": "NTN NF2307EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 109, "fatigue_load_limit_kN": 13.3, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 737, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF2307EA appears as a 35 mm bore single-row cylindrical roller bearing (117 kN C / 109 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF2307EA reads as NF (one rib on each ring), ISO 15 series, and bore 35 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 22.5 mm radial section ((80−35)/2) frames the roller complement; capacity per millimetre of bore is about 3.3 kN/mm before application factors. Selection arithmetic: Pu 13.3 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.93 (109/117 kN) shows the high-static-capacity proportioning of this 35 mm bore. Heat the inner ring to max 120 °C for the 35 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2307EA.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2307EA skids at 7,200 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full NF2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 22.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "The 117/109 kN ratings, 13.3 kN Pu and 737 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2307EA?", "a": "NF2307EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 31 mm width (1.378 × 3.15 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 109 kN, Pu 13.3 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 737 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2307EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2307EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2307ea", "＊nf2307ea", "NF2307EA" ], "locale_variants": {} }, { "sku": "NF307EA", "brand": "NTN", "manufacturer_designation": "NTN NF307EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 83.5, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 8100, "max_rpm": 8100, "speed_oil_rpm": 11500, "weight_g": 483, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF307EA denotes a 35×80×21 mm (1.378 × 3.15 × 0.827 in) cylindrical roller bearing in the NF300 family, the EA high-capacity pressed sheet-steel cage. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 35 mm, with 80 mm OD and 21 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF307EA. Equivalent-load planning treats NF307EA as a pure radial bearing: keep P below 83.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF307EA.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF307EA.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF307EA skids at 8,100 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF307EA skids at 8,100 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NF307EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 83.5/71 kN ratings, 8.65 kN Pu and 483 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF307EA?", "a": "NF307EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 21 mm width (1.378 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 8,100 r/min, oil 11,500 r/min, mass about 483 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF307EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF307EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,100 r/min grease / 11,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf307ea", "＊nf307ea", "NF307EA" ], "locale_variants": {} }, { "sku": "NJ2307EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2307EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 109, "fatigue_load_limit_kN": 13.3, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 737, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2307EA appears as a 35 mm bore single-row cylindrical roller bearing (117 kN C / 109 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2307EA floats or locates; the numeric remainder is the ISO 15 series and 35 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ2307EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 117 kN C assumes clean oil and adequate film; the 13.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 35 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2307EA.", "The 22.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2307EA skids at 7,200 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 117/109 kN ratings, 13.3 kN Pu and 737 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2307EA?", "a": "NJ2307EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 31 mm width (1.378 × 3.15 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 109 kN, Pu 13.3 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 737 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2307EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2307EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2307ea", "＊nj2307ea", "NJ2307EA" ], "locale_variants": {} }, { "sku": "NJ307EA", "brand": "NTN", "manufacturer_designation": "NTN NJ307EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 83.5, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 8100, "max_rpm": 8100, "speed_oil_rpm": 11500, "weight_g": 483, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ307EA appears as a 35 mm bore single-row cylindrical roller bearing (83.5 kN C / 71 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 35 mm, with 80 mm OD and 21 mm width from the ISO 15 general plan. With C 83.5 kN and C0 71 kN (C0/C ≈ 0.85) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 35 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ307EA.", "The NJ rib arrangement is not interchangeable with another prefix on the same 35 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 80×21 mm envelope matches.", "Open NJ307EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "Grease limiting speed 8,100 r/min and oil 11,500 r/min are different limits for NJ307EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ307EA skids at 8,100 r/min and fails by smearing long before L10 fatigue.", "The 83.5/71 kN ratings, 8.65 kN Pu and 483 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ307EA?", "a": "NJ307EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 21 mm width (1.378 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 8,100 r/min, oil 11,500 r/min, mass about 483 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ307EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ307EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,100 r/min grease / 11,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj307ea", "＊nj307ea", "NJ307EA" ], "locale_variants": {} }, { "sku": "NU2307EA", "brand": "NTN", "manufacturer_designation": "NTN NU2307EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 109, "fatigue_load_limit_kN": 13.3, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 737, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 35 mm shaft NTN supplies NU2307EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 7,200 r/min on grease and 10,200 r/min on oil. Numbering ties NU2307EA to its envelope: type code NU, series NU2300, 35 mm bore; the 80×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 7,200 r/min grease and 10,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 35 mm bore. Mass 737 g for the 35×80×31 mm NU2307EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 35 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2307EA.", "Open NU2307EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 117/109 kN pair here belongs to NU2307EA as printed, not to the bare size.", "The NU rib arrangement is not interchangeable with another prefix on the same 35 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 80×31 mm envelope matches.", "If the shaft must be located both ways, do not use NU2307EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 117/109 kN ratings, 13.3 kN Pu and 737 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2307EA?", "a": "NU2307EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 31 mm width (1.378 × 3.15 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 109 kN, Pu 13.3 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 737 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2307EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2307EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2307ea", "＊nu2307ea", "NU2307EA" ], "locale_variants": {} }, { "sku": "NU307EA", "brand": "NTN", "manufacturer_designation": "NTN NU307EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 83.5, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 8100, "max_rpm": 8100, "speed_oil_rpm": 11500, "weight_g": 483, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU307EA on the 35×80 mm envelope, 21 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 8,100 r/min. Digit by digit, NU307EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 35 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 11,500 r/min with oil versus 8,100 r/min with grease (a 3,400 r/min band), lubrication choice for NU307EA is a thermal decision, not just a sealing one. The 35 mm (1.378 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 21 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU307EA; an oversized radius locks the ring on its face and tilts the 21 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU307EA.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU307EA skids at 8,100 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "Do not replace NU307EA with a deep-groove ball bearing on rating alone: line contact gives 83.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 8,100 r/min and oil 11,500 r/min are different limits for NU307EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 83.5/71 kN ratings, 8.65 kN Pu and 483 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU307EA?", "a": "NU307EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 21 mm width (1.378 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 8,100 r/min, oil 11,500 r/min, mass about 483 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU307EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU307EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,100 r/min grease / 11,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu307ea", "＊nu307ea", "NU307EA" ], "locale_variants": {} }, { "sku": "NUP2307EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2307EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 109, "fatigue_load_limit_kN": 13.3, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 737, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2307EA is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 35×80×31 mm ISO 15 envelope. Digit by digit, NUP2307EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 35 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 31 mm width and 22.5 mm section put the NUP2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 117 kN C assumes clean oil and adequate film; the 13.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 35 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2307EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 22.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Open NUP2307EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "The 117/109 kN ratings, 13.3 kN Pu and 737 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2307EA?", "a": "NUP2307EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 31 mm width (1.378 × 3.15 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 109 kN, Pu 13.3 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 737 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2307EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2307EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2307ea", "＊nup2307ea", "NUP2307EA" ], "locale_variants": {} }, { "sku": "NUP307EA", "brand": "NTN", "manufacturer_designation": "NTN NUP307EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 83.5, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 8100, "max_rpm": 8100, "speed_oil_rpm": 11500, "weight_g": 483, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP307EA denotes a 35×80×21 mm (1.378 × 3.15 × 0.827 in) cylindrical roller bearing in the NUP300 family, the EA high-capacity pressed sheet-steel cage. Numbering ties NUP307EA to its envelope: type code NUP, series NUP300, 35 mm bore; the 80×21 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 83.5 kN and C0 71 kN (C0/C ≈ 0.85) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Selection arithmetic: Pu 8.65 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.85 (71/83.5 kN) shows the high-static-capacity proportioning of this 35 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 35 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP307EA.", "The 22.5 mm section at 35 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 21 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP307EA skids at 8,100 r/min and fails by smearing long before L10 fatigue.", "The 83.5/71 kN ratings, 8.65 kN Pu and 483 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP307EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP307EA?", "a": "NUP307EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 35 mm bore, 80 mm OD and 21 mm width (1.378 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 8,100 r/min, oil 11,500 r/min, mass about 483 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP307EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP307EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP307EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 46.2 mm, Ew 70.2 mm. The nominal bore/OD remain 35/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,100 r/min grease / 11,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP307EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup307ea", "＊nup307ea", "NUP307EA" ], "locale_variants": {} }, { "sku": "N407", "brand": "NTN", "manufacturer_designation": "NTN N407", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 69, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7500, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 35 mm shaft NTN supplies N407: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 6,400 r/min on grease and 7,500 r/min on oil. Digit by digit, N407 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 35 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 53 mm and Ew 83 mm — the envelope inside the 35/100 mm bore/OD where the rollers actually run. The 2.4 kN-per-mm-bore figure (83.5 kN over 35 mm) lets a N407 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 35 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N407.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Grease limiting speed 6,400 r/min and oil 7,500 r/min are different limits for N407: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use N407 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The N rib arrangement is not interchangeable with another prefix on the same 35 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×25 mm envelope matches.", "The 83.5/69 kN ratings, 8.4 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N407 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N407?", "a": "N407 is an NTN N single-row cylindrical roller bearing to ISO 15: 35 mm bore, 100 mm OD and 25 mm width (1.378 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 69 kN, Pu 8.4 kN, grease limiting speed 6,400 r/min, oil 7,500 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N407 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N407 is supplied in the standard open execution shown in the table." }, { "q": "Can N407 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N407?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53 mm, Ew 83 mm. The nominal bore/OD remain 35/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N407", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n407", "N407" ], "locale_variants": {} }, { "sku": "NF407", "brand": "NTN", "manufacturer_designation": "NTN NF407", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 69, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7500, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF407 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 35×100×25 mm ISO 15 envelope. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 35 mm, with 100 mm OD and 25 mm width from the ISO 15 general plan. At 7,500 r/min with oil versus 6,400 r/min with grease (a 1,100 r/min band), lubrication choice for NF407 is a thermal decision, not just a sealing one. Speed ratio check: limiting 6,400 r/min is .85 of the 7,500 r/min oil value for NF407; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 35 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF407.", "If the shaft must be located both ways, do not use NF407 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NF407 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NF rib arrangement is not interchangeable with another prefix on the same 35 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 100×25 mm envelope matches.", "Grease limiting speed 6,400 r/min and oil 7,500 r/min are different limits for NF407: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 83.5/69 kN ratings, 8.4 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF407 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF407?", "a": "NF407 is an NTN NF single-row cylindrical roller bearing to ISO 15: 35 mm bore, 100 mm OD and 25 mm width (1.378 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 69 kN, Pu 8.4 kN, grease limiting speed 6,400 r/min, oil 7,500 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF407 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF407 is supplied in the standard open execution shown in the table." }, { "q": "Can NF407 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF407?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53 mm, Ew 83 mm. The nominal bore/OD remain 35/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF407", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf407", "NF407" ], "locale_variants": {} }, { "sku": "NJ407-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ407", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 69, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7500, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 35 mm shaft NTN supplies NJ407: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 6,400 r/min on grease and 7,500 r/min on oil. Numbering ties NJ407 to its envelope: type code NJ, series NJ400, 35 mm bore; the 100×25 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 83.5 kN and C0 69 kN (C0/C ≈ 0.83) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Selection arithmetic: Pu 8.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.83 (69/83.5 kN) shows the high-static-capacity proportioning of this 35 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ407.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ407.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ407 skids at 6,400 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 83.5/69 kN pair here belongs to NJ407 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NJ407 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ407 skids at 6,400 r/min and fails by smearing long before L10 fatigue.", "The 83.5/69 kN ratings, 8.4 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ407 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ407?", "a": "NJ407 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 35 mm bore, 100 mm OD and 25 mm width (1.378 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 69 kN, Pu 8.4 kN, grease limiting speed 6,400 r/min, oil 7,500 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ407 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ407 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ407 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ407?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53 mm, Ew 83 mm. The nominal bore/OD remain 35/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ407", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj407", "NJ407", "NJ407-NTN" ], "locale_variants": {} }, { "sku": "NU407-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU407", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 69, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7500, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU407 is the heavy (04) section of the NTN NU400 dimension series for a 35 mm shaft — 83.5 kN of basic dynamic capacity in a 965 g, open bearing. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU407 floats or locates; the numeric remainder is the ISO 15 series and 35 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU407 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 2.4 kN-per-mm-bore figure (83.5 kN over 35 mm) lets a NU407 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU407; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU407.", "Grease limiting speed 6,400 r/min and oil 7,500 r/min are different limits for NU407: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NU407 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU407 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "Wide (22/23) and light (10/49) executions at 35 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 83.5/69 kN ratings, 8.4 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU407 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU407?", "a": "NU407 is an NTN NU single-row cylindrical roller bearing to ISO 15: 35 mm bore, 100 mm OD and 25 mm width (1.378 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 69 kN, Pu 8.4 kN, grease limiting speed 6,400 r/min, oil 7,500 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU407 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU407 is supplied in the standard open execution shown in the table." }, { "q": "Can NU407 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU407?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53 mm, Ew 83 mm. The nominal bore/OD remain 35/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU407", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu407", "NU407", "NU407-NTN" ], "locale_variants": {} }, { "sku": "NUP407", "brand": "NTN", "manufacturer_designation": "NTN NUP407", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 69, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7500, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP407 on the 35×100 mm envelope, 25 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 6,400 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP407 floats or locates; the numeric remainder is the ISO 15 series and 35 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP407. Speed ratio check: limiting 6,400 r/min is .85 of the 7,500 r/min oil value for NUP407; grease-churn heating closes that gap as fill quantity rises. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP407.", "Open NUP407 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "Grease limiting speed 6,400 r/min and oil 7,500 r/min are different limits for NUP407: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NUP407 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 35 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 83.5/69 kN ratings, 8.4 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP407 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP407?", "a": "NUP407 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 35 mm bore, 100 mm OD and 25 mm width (1.378 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 69 kN, Pu 8.4 kN, grease limiting speed 6,400 r/min, oil 7,500 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP407 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP407 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP407 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP407?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53 mm, Ew 83 mm. The nominal bore/OD remain 35/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP407", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup407", "NUP407" ], "locale_variants": {} }, { "sku": "N1008", "brand": "NTN", "manufacturer_designation": "NTN N1008", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30.5, "static_load_kN": 29, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 13000, "weight_g": 217, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1008 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 40×68×15 mm ISO 15 envelope. Digit by digit, N1008 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 47 mm and Ew 61 mm — the envelope inside the 40/68 mm bore/OD where the rollers actually run. Equivalent-load planning treats N1008 as a pure radial bearing: keep P below 30.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1008.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N1008.", "Open N1008 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "If the shaft must be located both ways, do not use N1008 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace N1008 with a deep-groove ball bearing on rating alone: line contact gives 30.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The N rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 68×15 mm envelope matches.", "The 30.5/29 kN ratings, 3.55 kN Pu and 217 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1008 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1008?", "a": "N1008 is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 68 mm OD and 15 mm width (1.575 × 2.677 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 30.5 kN, C0 29 kN, Pu 3.55 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 217 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1008 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1008 is supplied in the standard open execution shown in the table." }, { "q": "Can N1008 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1008?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 47 mm, Ew 61 mm. The nominal bore/OD remain 40/68 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 13,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1008", "N1008" ], "locale_variants": {} }, { "sku": "NJ1008", "brand": "NTN", "manufacturer_designation": "NTN NJ1008", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30.5, "static_load_kN": 29, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 13000, "weight_g": 217, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ1008 denotes a 40×68×15 mm (1.575 × 2.677 × 0.591 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 3.55 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.95 (29/30.5 kN) shows the high-static-capacity proportioning of this 40 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1008 non-locating position preloads the bearing when the shaft grows.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ1008.", "The 15 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 68 mm race brinells and releases as vibration within hours.", "The 15 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 30.5/29 kN pair here belongs to NJ1008 as printed, not to the bare size.", "The 30.5/29 kN ratings, 3.55 kN Pu and 217 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1008 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1008?", "a": "NJ1008 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 68 mm OD and 15 mm width (1.575 × 2.677 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 30.5 kN, C0 29 kN, Pu 3.55 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 217 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1008 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1008 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1008 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1008?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 47 mm, Ew 61 mm. The nominal bore/OD remain 40/68 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 13,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1008", "NJ1008" ], "locale_variants": {} }, { "sku": "NN3008", "brand": "NTN", "manufacturer_designation": "NTN NN3008", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48, "static_load_kN": 55.5, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 11000, "weight_g": 312, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3008 appears as a 40 mm bore single-row cylindrical roller bearing (48 kN C / 55.5 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 68 mm OD and 21 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 14.0 mm radial section between the 40 mm bore and 68 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN3008; an oversized radius locks the ring on its face and tilts the 21 mm-wide seat.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3008.", "The NN rib arrangement is not interchangeable with another prefix on the same 40 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 68×21 mm envelope matches.", "Open NN3008 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The NN rib arrangement is not interchangeable with another prefix on the same 40 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 68×21 mm envelope matches.", "The NN rib arrangement is not interchangeable with another prefix on the same 40 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 68×21 mm envelope matches.", "The 48/55.5 kN ratings, 6.75 kN Pu and 312 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3008 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3008?", "a": "NN3008 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 40 mm bore, 68 mm OD and 21 mm width (1.575 × 2.677 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 48 kN, C0 55.5 kN, Pu 6.75 kN, grease limiting speed 9,700 r/min, oil 11,000 r/min, mass about 312 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3008 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3008 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3008?", "a": "NN3008 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3008?", "a": "NTN rates NN3008 at 9,700 r/min with grease and 11,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3008", "NN3008" ], "locale_variants": {} }, { "sku": "NN3008K", "brand": "NTN", "manufacturer_designation": "NTN NN3008K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48, "static_load_kN": 55.5, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 9700, "max_rpm": 9700, "speed_oil_rpm": 11000, "weight_g": 303, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3008K is the standard section of the NTN NN3000 dimension series for a 40 mm shaft — 48 kN of basic dynamic capacity in a 303 g, open bearing. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 68 mm OD and 21 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 14.0 mm radial section between the 40 mm bore and 68 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Mass 303 g for the 40×68×21 mm NN3008K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3008K.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 48/55.5 kN pair here belongs to NN3008K as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3008K skids at 9,700 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 68 mm race brinells and releases as vibration within hours.", "The NN rib arrangement is not interchangeable with another prefix on the same 40 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 68×21 mm envelope matches.", "The 48/55.5 kN ratings, 6.75 kN Pu and 303 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3008K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3008K?", "a": "NN3008K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 40 mm bore, 68 mm OD and 21 mm width (1.575 × 2.677 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 48 kN, C0 55.5 kN, Pu 6.75 kN, grease limiting speed 9,700 r/min, oil 11,000 r/min, mass about 303 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3008K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3008K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3008K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3008K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3008 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3008K?", "a": "NTN rates NN3008K at 9,700 r/min with grease and 11,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3008K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3008k", "NN3008K" ], "locale_variants": {} }, { "sku": "NU1008", "brand": "NTN", "manufacturer_designation": "NTN NU1008", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30.5, "static_load_kN": 29, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 13000, "weight_g": 217, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1008 appears as a 40 mm bore single-row cylindrical roller bearing (30.5 kN C / 29 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 68 mm OD and 15 mm width from the ISO 15 general plan. With C 30.5 kN and C0 29 kN (C0/C ≈ 0.95) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. The 0.8 kN-per-mm-bore figure (30.5 kN over 40 mm) lets a NU1008 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU1008; an oversized radius locks the ring on its face and tilts the 15 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU1008.", "Grease limiting speed 11,000 r/min and oil 13,000 r/min are different limits for NU1008: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NU1008 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 15 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1008 skids at 11,000 r/min and fails by smearing long before L10 fatigue.", "The 30.5/29 kN ratings, 3.55 kN Pu and 217 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1008 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1008?", "a": "NU1008 is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 68 mm OD and 15 mm width (1.575 × 2.677 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 30.5 kN, C0 29 kN, Pu 3.55 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 217 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1008 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1008 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1008 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1008?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 47 mm, Ew 61 mm. The nominal bore/OD remain 40/68 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 13,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1008-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1008", "NU1008" ], "locale_variants": {} }, { "sku": "NUP1008", "brand": "NTN", "manufacturer_designation": "NTN NUP1008", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30.5, "static_load_kN": 29, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "speed_oil_rpm": 13000, "weight_g": 217, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1008 appears as a 40 mm bore single-row cylindrical roller bearing (30.5 kN C / 29 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 68 mm OD and 15 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 47 mm and Ew 61 mm — the envelope inside the 40/68 mm bore/OD where the rollers actually run. Thermal planning around the 11,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 13,000 r/min for continuously high-duty 40 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 40 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP1008.", "Grease limiting speed 11,000 r/min and oil 13,000 r/min are different limits for NUP1008: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 68 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 30.5/29 kN pair here belongs to NUP1008 as printed, not to the bare size.", "The NUP rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 68×15 mm envelope matches.", "The 30.5/29 kN ratings, 3.55 kN Pu and 217 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1008 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1008?", "a": "NUP1008 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 68 mm OD and 15 mm width (1.575 × 2.677 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 30.5 kN, C0 29 kN, Pu 3.55 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 217 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1008 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1008 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1008 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1008?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 47 mm, Ew 61 mm. The nominal bore/OD remain 40/68 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 13,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1008", "NUP1008" ], "locale_variants": {} }, { "sku": "N208", "brand": "NTN", "manufacturer_designation": "NTN N208", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 43, "fatigue_load_limit_kN": 5.25, "limiting_speed_rpm": 9400, "max_rpm": 9400, "speed_oil_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N208 appears as a 40 mm bore single-row cylindrical roller bearing (48.5 kN C / 43 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N208 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N208. Speed ratio check: limiting 9,400 r/min is .85 of the 11,000 r/min oil value for N208; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N208 non-locating position preloads the bearing when the shaft grows.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N208.", "Do not replace N208 with a deep-groove ball bearing on rating alone: line contact gives 48.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use N208 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 48.5/43 kN ratings, 5.25 kN Pu and 370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N208?", "a": "N208 is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 48.5 kN, C0 43 kN, Pu 5.25 kN, grease limiting speed 9,400 r/min, oil 11,000 r/min, mass about 370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N208 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N208 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,400 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N208-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n208", "＊＊n208", "N208" ], "locale_variants": {} }, { "sku": "N208EA", "brand": "NTN", "manufacturer_designation": "NTN N208EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66, "static_load_kN": 55.5, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 365, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N208EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 40×80×18 mm ISO 15 envelope. Digit by digit, N208EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives N208EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 12,000 r/min for continuously high-duty 40 mm positions. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N208EA.", "Grease limiting speed 8,500 r/min and oil 12,000 r/min are different limits for N208EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 20.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 66/55.5 kN pair here belongs to N208EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 66/55.5 kN ratings, 6.75 kN Pu and 365 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N208EA?", "a": "N208EA is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66 kN, C0 55.5 kN, Pu 6.75 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 365 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N208EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N208EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n208ea", "＊n208ea", "N208EA" ], "locale_variants": {} }, { "sku": "N2208", "brand": "NTN", "manufacturer_designation": "NTN N2208", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62, "fatigue_load_limit_kN": 7.55, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2208 on the 40×80 mm envelope, 23 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 8,500 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N2208 floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded N2208 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 40 mm (1.575 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 40 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2208.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 20.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "Do not replace N2208 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace N2208 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 64.5/62 kN ratings, 7.55 kN Pu and 480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2208?", "a": "N2208 is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62 kN, Pu 7.55 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2208 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2208 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2208", "＊＊n2208", "N2208" ], "locale_variants": {} }, { "sku": "N2208EA", "brand": "NTN", "manufacturer_designation": "NTN N2208EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.5, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10700, "weight_g": 491, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2208EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 85.5 kN dynamic rating in the 40 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N2208EA floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded N2208EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 7,600 r/min is .71 of the 10,700 r/min oil value for N2208EA; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 40 mm shaft.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2208EA.", "If the shaft must be located both ways, do not use N2208EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "If the shaft must be located both ways, do not use N2208EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace N2208EA with a deep-groove ball bearing on rating alone: line contact gives 85.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 85.5/77.5 kN ratings, 9.45 kN Pu and 491 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2208EA?", "a": "N2208EA is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 85.5 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 7,600 r/min, oil 10,700 r/min, mass about 491 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2208EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2208EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2208ea", "＊n2208ea", "N2208EA" ], "locale_variants": {} }, { "sku": "NF208", "brand": "NTN", "manufacturer_designation": "NTN NF208", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 43, "fatigue_load_limit_kN": 5.25, "limiting_speed_rpm": 9400, "max_rpm": 9400, "speed_oil_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 40 mm shaft NTN supplies NF208: one integral rib on each ring; the open execution is rated 9,400 r/min on grease and 11,000 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 80 mm OD and 18 mm width from the ISO 15 general plan. With C 48.5 kN and C0 43 kN (C0/C ≈ 0.89) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. The 40 mm (1.575 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 18 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF208.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF208.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 48.5/43 kN pair here belongs to NF208 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NF208 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF208 skids at 9,400 r/min and fails by smearing long before L10 fatigue.", "The 48.5/43 kN ratings, 5.25 kN Pu and 370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF208?", "a": "NF208 is an NTN NF single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 48.5 kN, C0 43 kN, Pu 5.25 kN, grease limiting speed 9,400 r/min, oil 11,000 r/min, mass about 370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF208 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF208 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,400 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf208", "＊＊nf208", "NF208" ], "locale_variants": {} }, { "sku": "NF208EA", "brand": "NTN", "manufacturer_designation": "NTN NF208EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66, "static_load_kN": 55.5, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 365, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF208EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 66 kN dynamic rating in the 40 mm bore. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF208EA floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NF208EA designation when purchasing. Mass 365 g for the 40×80×18 mm NF208EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF208EA.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF208EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 66/55.5 kN pair here belongs to NF208EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use NF208EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 66/55.5 kN pair here belongs to NF208EA as printed, not to the bare size.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The 66/55.5 kN ratings, 6.75 kN Pu and 365 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF208EA?", "a": "NF208EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66 kN, C0 55.5 kN, Pu 6.75 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 365 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF208EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF208EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf208ea", "＊nf208ea", "NF208EA" ], "locale_variants": {} }, { "sku": "NF2208EA", "brand": "NTN", "manufacturer_designation": "NTN NF2208EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.5, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10700, "weight_g": 491, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF2208EA on the 40×80 mm envelope, 23 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 7,600 r/min. Numbering ties NF2208EA to its envelope: type code NF, series NF2200, 40 mm bore; the 80×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 85.5 kN and C0 77.5 kN (C0/C ≈ 0.91) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Speed ratio check: limiting 7,600 r/min is .71 of the 10,700 r/min oil value for NF2208EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF2208EA.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2208EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 85.5/77.5 kN pair here belongs to NF2208EA as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2208EA skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2208EA skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2208EA skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "The 85.5/77.5 kN ratings, 9.45 kN Pu and 491 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2208EA?", "a": "NF2208EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 85.5 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 7,600 r/min, oil 10,700 r/min, mass about 491 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2208EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2208EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2208ea", "＊nf2208ea", "NF2208EA" ], "locale_variants": {} }, { "sku": "NJ208", "brand": "NTN", "manufacturer_designation": "NTN NJ208", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 43, "fatigue_load_limit_kN": 5.25, "limiting_speed_rpm": 9400, "max_rpm": 9400, "speed_oil_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ208 is the standard section of the NTN NJ200 dimension series for a 40 mm shaft — 48.5 kN of basic dynamic capacity in a 370 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 80 mm OD and 18 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ208. Speed ratio check: limiting 9,400 r/min is .85 of the 11,000 r/min oil value for NJ208; grease-churn heating closes that gap as fill quantity rises. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ208.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The NJ rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 80×18 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 48.5/43 kN ratings, 5.25 kN Pu and 370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ208?", "a": "NJ208 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 48.5 kN, C0 43 kN, Pu 5.25 kN, grease limiting speed 9,400 r/min, oil 11,000 r/min, mass about 370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ208 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ208 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,400 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ208-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj208", "＊＊nj208", "NJ208" ], "locale_variants": {} }, { "sku": "NJ208EA", "brand": "NTN", "manufacturer_designation": "NTN NJ208EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66, "static_load_kN": 55.5, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 365, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 40 mm shaft NTN supplies NJ208EA: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 8,500 r/min on grease and 12,000 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ208EA floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. The 20.0 mm radial section ((80−40)/2) frames the roller complement; capacity per millimetre of bore is about 1.6 kN/mm before application factors. Rating life at 66 kN C assumes clean oil and adequate film; the 6.75 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 40 mm shaft.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ208EA.", "Grease limiting speed 8,500 r/min and oil 12,000 r/min are different limits for NJ208EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NJ208EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 20.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "The 20.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "The 66/55.5 kN ratings, 6.75 kN Pu and 365 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ208EA?", "a": "NJ208EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66 kN, C0 55.5 kN, Pu 6.75 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 365 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ208EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ208EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj208ea", "＊nj208ea", "NJ208EA" ], "locale_variants": {} }, { "sku": "NJ2208", "brand": "NTN", "manufacturer_designation": "NTN NJ2208", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62, "fatigue_load_limit_kN": 7.55, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2208 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 40×80×23 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 80 mm OD and 23 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2208. Mass 480 g for the 40×80×23 mm NJ2208 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2208.", "Grease limiting speed 8,500 r/min and oil 10,000 r/min are different limits for NJ2208: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NJ2208 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 64.5/62 kN ratings, 7.55 kN Pu and 480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2208?", "a": "NJ2208 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62 kN, Pu 7.55 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2208 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2208 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2208-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2208", "＊＊nj2208", "NJ2208" ], "locale_variants": {} }, { "sku": "NJ2208EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2208EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.5, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10700, "weight_g": 491, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 40 mm shaft NTN supplies NJ2208EA: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 7,600 r/min on grease and 10,700 r/min on oil. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 7,600 r/min grease and 10,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 40 mm bore. The 2.1 kN-per-mm-bore figure (85.5 kN over 40 mm) lets a NJ2208EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 40 mm shaft.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2208EA.", "Open NJ2208EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "Do not replace NJ2208EA with a deep-groove ball bearing on rating alone: line contact gives 85.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 85.5/77.5 kN pair here belongs to NJ2208EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use NJ2208EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 85.5/77.5 kN ratings, 9.45 kN Pu and 491 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2208EA?", "a": "NJ2208EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 85.5 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 7,600 r/min, oil 10,700 r/min, mass about 491 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2208EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2208EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2208ea", "＊nj2208ea", "NJ2208EA" ], "locale_variants": {} }, { "sku": "NU208-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU208", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 43, "fatigue_load_limit_kN": 5.25, "limiting_speed_rpm": 9400, "max_rpm": 9400, "speed_oil_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU208 on the 40×80 mm envelope, 18 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 9,400 r/min. Digit by digit, NU208 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU208. Rating life at 48.5 kN C assumes clean oil and adequate film; the 5.25 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU208.", "If the shaft must be located both ways, do not use NU208 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU208 skids at 9,400 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NU208 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 48.5/43 kN ratings, 5.25 kN Pu and 370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU208?", "a": "NU208 is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 48.5 kN, C0 43 kN, Pu 5.25 kN, grease limiting speed 9,400 r/min, oil 11,000 r/min, mass about 370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU208 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU208 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,400 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu208", "＊＊nu208", "NU208", "NU208-NTN" ], "locale_variants": {} }, { "sku": "NU208EA", "brand": "NTN", "manufacturer_designation": "NTN NU208EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66, "static_load_kN": 55.5, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 365, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU208EA is the standard section of the NTN NU200 dimension series for a 40 mm shaft — 66 kN of basic dynamic capacity in a 365 g, open bearing. Digit by digit, NU208EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU208EA. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 12,000 r/min for continuously high-duty 40 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 40 mm shaft.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU208EA.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU208EA skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "Open NU208EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 66/55.5 kN ratings, 6.75 kN Pu and 365 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU208EA?", "a": "NU208EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66 kN, C0 55.5 kN, Pu 6.75 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 365 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU208EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU208EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu208ea", "＊nu208ea", "NU208EA" ], "locale_variants": {} }, { "sku": "NU2208-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2208", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62, "fatigue_load_limit_kN": 7.55, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2208 appears as a 40 mm bore single-row cylindrical roller bearing (64.5 kN C / 62 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2208 floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. The 23 mm width and 20.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 40 mm (1.575 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2208.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2208.", "Do not replace NU2208 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2208 skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "The NU rib arrangement is not interchangeable with another prefix on the same 40 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 80×23 mm envelope matches.", "Open NU2208 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The 64.5/62 kN ratings, 7.55 kN Pu and 480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2208?", "a": "NU2208 is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62 kN, Pu 7.55 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2208 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2208 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2208", "＊＊nu2208", "NU2208", "NU2208-NTN" ], "locale_variants": {} }, { "sku": "NU2208EA", "brand": "NTN", "manufacturer_designation": "NTN NU2208EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.5, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10700, "weight_g": 491, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2208EA is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 40×80×23 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 80 mm OD and 23 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 49.5 mm and Ew 71.5 mm — the envelope inside the 40/80 mm bore/OD where the rollers actually run. Equivalent-load planning treats NU2208EA as a pure radial bearing: keep P below 85.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2208EA.", "If the shaft must be located both ways, do not use NU2208EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 7,600 r/min and oil 10,700 r/min are different limits for NU2208EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NU rib arrangement is not interchangeable with another prefix on the same 40 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 80×23 mm envelope matches.", "The 85.5/77.5 kN ratings, 9.45 kN Pu and 491 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2208EA?", "a": "NU2208EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 85.5 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 7,600 r/min, oil 10,700 r/min, mass about 491 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2208EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2208EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2208ea", "＊nu2208ea", "NU2208EA" ], "locale_variants": {} }, { "sku": "NUP208", "brand": "NTN", "manufacturer_designation": "NTN NUP208", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 43, "fatigue_load_limit_kN": 5.25, "limiting_speed_rpm": 9400, "max_rpm": 9400, "speed_oil_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 40 mm shaft NTN supplies NUP208: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 9,400 r/min on grease and 11,000 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP208 floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 40 mm (1.575 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 18 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 40 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP208.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 48.5/43 kN pair here belongs to NUP208 as printed, not to the bare size.", "Grease limiting speed 9,400 r/min and oil 11,000 r/min are different limits for NUP208: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 48.5/43 kN pair here belongs to NUP208 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 48.5/43 kN pair here belongs to NUP208 as printed, not to the bare size.", "The 48.5/43 kN ratings, 5.25 kN Pu and 370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP208?", "a": "NUP208 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 48.5 kN, C0 43 kN, Pu 5.25 kN, grease limiting speed 9,400 r/min, oil 11,000 r/min, mass about 370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP208 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP208 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,400 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP208-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup208", "＊＊nup208", "NUP208" ], "locale_variants": {} }, { "sku": "NUP208EA", "brand": "NTN", "manufacturer_designation": "NTN NUP208EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66, "static_load_kN": 55.5, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 12000, "weight_g": 365, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP208EA appears as a 40 mm bore single-row cylindrical roller bearing (66 kN C / 55.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP208EA to its envelope: type code NUP, series NUP200, 40 mm bore; the 80×18 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 20.0 mm radial section ((80−40)/2) frames the roller complement; capacity per millimetre of bore is about 1.6 kN/mm before application factors. The 1.6 kN-per-mm-bore figure (66 kN over 40 mm) lets a NUP208EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 40 mm shaft.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP208EA.", "The 20.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP208EA skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "Do not replace NUP208EA with a deep-groove ball bearing on rating alone: line contact gives 66 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 20.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "The 66/55.5 kN ratings, 6.75 kN Pu and 365 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP208EA?", "a": "NUP208EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 18 mm width (1.575 × 3.15 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66 kN, C0 55.5 kN, Pu 6.75 kN, grease limiting speed 8,500 r/min, oil 12,000 r/min, mass about 365 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP208EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP208EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup208ea", "＊nup208ea", "NUP208EA" ], "locale_variants": {} }, { "sku": "NUP2208", "brand": "NTN", "manufacturer_designation": "NTN NUP2208", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62, "fatigue_load_limit_kN": 7.55, "limiting_speed_rpm": 8500, "max_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2208 denotes a 40×80×23 mm (1.575 × 3.15 × 0.906 in) cylindrical roller bearing in the NUP2200 family, a pressed sheet-steel cage. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 50 mm and Ew 70 mm — the envelope inside the 40/80 mm bore/OD where the rollers actually run. The 40 mm (1.575 in) bore and 80 mm (3.15 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Heat the inner ring to max 120 °C for the 40 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2208.", "The 20.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2208 skids at 8,500 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The NUP rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 80×23 mm envelope matches.", "The 64.5/62 kN ratings, 7.55 kN Pu and 480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2208 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2208?", "a": "NUP2208 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62 kN, Pu 7.55 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2208 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2208 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2208 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2208?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 50 mm, Ew 70 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2208-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2208", "＊＊nup2208", "NUP2208" ], "locale_variants": {} }, { "sku": "NUP2208EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2208EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.5, "static_load_kN": 77.5, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10700, "weight_g": 491, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2208EA appears as a 40 mm bore single-row cylindrical roller bearing (85.5 kN C / 77.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP2208EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NUP2208EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 491 g for the 40×80×23 mm NUP2208EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 40 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2208EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "Open NUP2208EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 85.5/77.5 kN ratings, 9.45 kN Pu and 491 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2208EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2208EA?", "a": "NUP2208EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 85.5 kN, C0 77.5 kN, Pu 9.45 kN, grease limiting speed 7,600 r/min, oil 10,700 r/min, mass about 491 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2208EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2208EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2208EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 49.5 mm, Ew 71.5 mm. The nominal bore/OD remain 40/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2208EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2208ea", "＊nup2208ea", "NUP2208EA" ], "locale_variants": {} }, { "sku": "N2308", "brand": "NTN", "manufacturer_designation": "NTN N2308", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 91.5, "static_load_kN": 88, "fatigue_load_limit_kN": 10.7, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 932, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 40 mm shaft NTN supplies N2308: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 7,000 r/min on grease and 8,200 r/min on oil. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full N2308 designation when purchasing. Rating life at 91.5 kN C assumes clean oil and adequate film; the 10.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2308 non-locating position preloads the bearing when the shaft grows.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2308.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2308 skids at 7,000 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The 91.5/88 kN ratings, 10.7 kN Pu and 932 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2308?", "a": "N2308 is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 91.5 kN, C0 88 kN, Pu 10.7 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 932 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2308 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2308 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2308", "＊＊n2308", "N2308" ], "locale_variants": {} }, { "sku": "N2308EA", "brand": "NTN", "manufacturer_designation": "NTN N2308EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 122, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 9000, "weight_g": 952, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2308EA denotes a 40×90×33 mm (1.575 × 3.543 × 1.299 in) cylindrical roller bearing in the N2300 family, the EA high-capacity pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). The 33 mm width and 25.0 mm section put the N2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2308EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2308EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "Grease limiting speed 6,400 r/min and oil 9,000 r/min are different limits for N2308EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Open N2308EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The 135/122 kN ratings, 14.9 kN Pu and 952 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2308EA?", "a": "N2308EA is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 135 kN, C0 122 kN, Pu 14.9 kN, grease limiting speed 6,400 r/min, oil 9,000 r/min, mass about 952 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2308EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2308EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2308ea", "＊n2308ea", "N2308EA" ], "locale_variants": {} }, { "sku": "N308", "brand": "NTN", "manufacturer_designation": "NTN N308", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 65, "static_load_kN": 57, "fatigue_load_limit_kN": 6.95, "limiting_speed_rpm": 8000, "max_rpm": 8000, "speed_oil_rpm": 9400, "weight_g": 643, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N308 is the standard section of the NTN N300 dimension series for a 40 mm shaft — 65 kN of basic dynamic capacity in a 643 g, open bearing. Numbering ties N308 to its envelope: type code N, series N300, 40 mm bore; the 90×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 65 kN and C0 57 kN (C0/C ≈ 0.88) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Equivalent-load planning treats N308 as a pure radial bearing: keep P below 65 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N308.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 65/57 kN pair here belongs to N308 as printed, not to the bare size.", "If the shaft must be located both ways, do not use N308 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N308 skids at 8,000 r/min and fails by smearing long before L10 fatigue.", "The 65/57 kN ratings, 6.95 kN Pu and 643 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N308?", "a": "N308 is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 65 kN, C0 57 kN, Pu 6.95 kN, grease limiting speed 8,000 r/min, oil 9,400 r/min, mass about 643 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N308 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N308 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,000 r/min grease / 9,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N308-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n308", "＊＊n308", "N308" ], "locale_variants": {} }, { "sku": "N308EA", "brand": "NTN", "manufacturer_designation": "NTN N308EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 81.5, "fatigue_load_limit_kN": 9.95, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 658, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N308EA appears as a 40 mm bore single-row cylindrical roller bearing (98.5 kN C / 81.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties N308EA to its envelope: type code N, series N300, 40 mm bore; the 90×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N308EA. Rating life at 98.5 kN C assumes clean oil and adequate film; the 9.95 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N308EA.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98.5/81.5 kN pair here belongs to N308EA as printed, not to the bare size.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "The 98.5/81.5 kN ratings, 9.95 kN Pu and 658 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N308EA?", "a": "N308EA is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 81.5 kN, Pu 9.95 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 658 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N308EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N308EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n308ea", "＊n308ea", "N308EA" ], "locale_variants": {} }, { "sku": "NF2308EA", "brand": "NTN", "manufacturer_designation": "NTN NF2308EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 122, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 9000, "weight_g": 952, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2308EA is the extra-wide (23) section of the NTN NF2300 dimension series for a 40 mm shaft — 135 kN of basic dynamic capacity in a 952 g, open bearing. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 90 mm OD and 33 mm width from the ISO 15 general plan. The 33 mm width and 25.0 mm section put the NF2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF2308EA.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2308EA.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NF2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NF rib arrangement is not interchangeable with another prefix on the same 40 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 90×33 mm envelope matches.", "Grease limiting speed 6,400 r/min and oil 9,000 r/min are different limits for NF2308EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NF2308EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The 135/122 kN ratings, 14.9 kN Pu and 952 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2308EA?", "a": "NF2308EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 135 kN, C0 122 kN, Pu 14.9 kN, grease limiting speed 6,400 r/min, oil 9,000 r/min, mass about 952 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2308EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2308EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2308ea", "＊nf2308ea", "NF2308EA" ], "locale_variants": {} }, { "sku": "NF308", "brand": "NTN", "manufacturer_designation": "NTN NF308", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 65, "static_load_kN": 57, "fatigue_load_limit_kN": 6.95, "limiting_speed_rpm": 8000, "max_rpm": 8000, "speed_oil_rpm": 9400, "weight_g": 643, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF308 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 65 kN dynamic rating in the 40 mm bore. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF308 floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Rating life at 65 kN C assumes clean oil and adequate film; the 6.95 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 40 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF308.", "Do not replace NF308 with a deep-groove ball bearing on rating alone: line contact gives 65 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The NF rib arrangement is not interchangeable with another prefix on the same 40 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 65/57 kN pair here belongs to NF308 as printed, not to the bare size.", "The 65/57 kN ratings, 6.95 kN Pu and 643 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF308?", "a": "NF308 is an NTN NF single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 65 kN, C0 57 kN, Pu 6.95 kN, grease limiting speed 8,000 r/min, oil 9,400 r/min, mass about 643 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF308 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF308 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,000 r/min grease / 9,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf308", "＊＊nf308", "NF308" ], "locale_variants": {} }, { "sku": "NF308EA", "brand": "NTN", "manufacturer_designation": "NTN NF308EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 81.5, "fatigue_load_limit_kN": 9.95, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 658, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF308EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 40×90×23 mm ISO 15 envelope. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 9.95 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.83 (81.5/98.5 kN) shows the high-static-capacity proportioning of this 40 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF308EA.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF308EA.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NF308EA with a deep-groove ball bearing on rating alone: line contact gives 98.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98.5/81.5 kN pair here belongs to NF308EA as printed, not to the bare size.", "The 98.5/81.5 kN ratings, 9.95 kN Pu and 658 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF308EA?", "a": "NF308EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 81.5 kN, Pu 9.95 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 658 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF308EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF308EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf308ea", "＊nf308ea", "NF308EA" ], "locale_variants": {} }, { "sku": "NJ2308", "brand": "NTN", "manufacturer_designation": "NTN NJ2308", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 91.5, "static_load_kN": 88, "fatigue_load_limit_kN": 10.7, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 932, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2308 on the 40×90 mm envelope, 33 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 7,000 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). With C 91.5 kN and C0 88 kN (C0/C ≈ 0.96) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Speed ratio check: limiting 7,000 r/min is .85 of the 8,200 r/min oil value for NJ2308; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ2308; an oversized radius locks the ring on its face and tilts the 33 mm-wide seat.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2308.", "Open NJ2308 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2308 skids at 7,000 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2308 skids at 7,000 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2308 skids at 7,000 r/min and fails by smearing long before L10 fatigue.", "The 91.5/88 kN ratings, 10.7 kN Pu and 932 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2308?", "a": "NJ2308 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 91.5 kN, C0 88 kN, Pu 10.7 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 932 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2308 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2308 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2308-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2308", "＊＊nj2308", "NJ2308" ], "locale_variants": {} }, { "sku": "NJ2308EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2308EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 122, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 9000, "weight_g": 952, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2308EA is the extra-wide (23) section of the NTN NJ2300 dimension series for a 40 mm shaft — 135 kN of basic dynamic capacity in a 952 g, open bearing. Digit by digit, NJ2308EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NJ2308EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 952 g for the 40×90×33 mm NJ2308EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2308EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2308EA.", "If the shaft must be located both ways, do not use NJ2308EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 90×33 mm envelope matches.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Do not replace NJ2308EA with a deep-groove ball bearing on rating alone: line contact gives 135 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 135/122 kN ratings, 14.9 kN Pu and 952 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2308EA?", "a": "NJ2308EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 135 kN, C0 122 kN, Pu 14.9 kN, grease limiting speed 6,400 r/min, oil 9,000 r/min, mass about 952 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2308EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2308EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2308ea", "＊nj2308ea", "NJ2308EA" ], "locale_variants": {} }, { "sku": "NJ308", "brand": "NTN", "manufacturer_designation": "NTN NJ308", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 65, "static_load_kN": 57, "fatigue_load_limit_kN": 6.95, "limiting_speed_rpm": 8000, "max_rpm": 8000, "speed_oil_rpm": 9400, "weight_g": 643, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ308 denotes a 40×90×23 mm (1.575 × 3.543 × 0.906 in) cylindrical roller bearing in the NJ300 family, a pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 8,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 9,400 r/min for continuously high-duty 40 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ308.", "Grease limiting speed 8,000 r/min and oil 9,400 r/min are different limits for NJ308: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NJ rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "Do not replace NJ308 with a deep-groove ball bearing on rating alone: line contact gives 65 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 65/57 kN pair here belongs to NJ308 as printed, not to the bare size.", "The 65/57 kN ratings, 6.95 kN Pu and 643 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ308?", "a": "NJ308 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 65 kN, C0 57 kN, Pu 6.95 kN, grease limiting speed 8,000 r/min, oil 9,400 r/min, mass about 643 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ308 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ308 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,000 r/min grease / 9,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ308-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj308", "＊＊nj308", "NJ308" ], "locale_variants": {} }, { "sku": "NJ308EA", "brand": "NTN", "manufacturer_designation": "NTN NJ308EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 81.5, "fatigue_load_limit_kN": 9.95, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 658, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ308EA is the standard section of the NTN NJ300 dimension series for a 40 mm shaft — 98.5 kN of basic dynamic capacity in a 658 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 40 mm (1.575 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ308EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ308EA.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ308EA skids at 7,200 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98.5/81.5 kN pair here belongs to NJ308EA as printed, not to the bare size.", "The 98.5/81.5 kN ratings, 9.95 kN Pu and 658 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ308EA?", "a": "NJ308EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 81.5 kN, Pu 9.95 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 658 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ308EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ308EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj308ea", "＊nj308ea", "NJ308EA" ], "locale_variants": {} }, { "sku": "NU2308-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2308", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 91.5, "static_load_kN": 88, "fatigue_load_limit_kN": 10.7, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 932, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2308 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 40×90×33 mm ISO 15 envelope. Digit by digit, NU2308 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 91.5 kN and C0 88 kN (C0/C ≈ 0.96) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 7,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 8,200 r/min for continuously high-duty 40 mm positions. Housing and shaft fillets must clear the ring chamfers of NU2308; an oversized radius locks the ring on its face and tilts the 33 mm-wide seat.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2308.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Do not replace NU2308 with a deep-groove ball bearing on rating alone: line contact gives 91.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2308 skids at 7,000 r/min and fails by smearing long before L10 fatigue.", "The 91.5/88 kN ratings, 10.7 kN Pu and 932 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2308?", "a": "NU2308 is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 91.5 kN, C0 88 kN, Pu 10.7 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 932 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2308 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2308 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2308", "＊＊nu2308", "NU2308", "NU2308-NTN" ], "locale_variants": {} }, { "sku": "NU2308EA", "brand": "NTN", "manufacturer_designation": "NTN NU2308EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 122, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 9000, "weight_g": 952, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2308EA appears as a 40 mm bore single-row cylindrical roller bearing (135 kN C / 122 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2308EA floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU2308EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 6,400 r/min is .71 of the 9,000 r/min oil value for NU2308EA; grease-churn heating closes that gap as fill quantity rises. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2308EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 135/122 kN pair here belongs to NU2308EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 135/122 kN ratings, 14.9 kN Pu and 952 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2308EA?", "a": "NU2308EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 135 kN, C0 122 kN, Pu 14.9 kN, grease limiting speed 6,400 r/min, oil 9,000 r/min, mass about 952 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2308EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2308EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2308ea", "＊nu2308ea", "NU2308EA" ], "locale_variants": {} }, { "sku": "NU308-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU308", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 65, "static_load_kN": 57, "fatigue_load_limit_kN": 6.95, "limiting_speed_rpm": 8000, "max_rpm": 8000, "speed_oil_rpm": 9400, "weight_g": 643, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU308 is the standard section of the NTN NU300 dimension series for a 40 mm shaft — 65 kN of basic dynamic capacity in a 643 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 90 mm OD and 23 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU308 designation when purchasing. Thermal planning around the 8,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 9,400 r/min for continuously high-duty 40 mm positions. Housing and shaft fillets must clear the ring chamfers of NU308; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU308.", "Open NU308 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 40 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The 65/57 kN ratings, 6.95 kN Pu and 643 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU308?", "a": "NU308 is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 65 kN, C0 57 kN, Pu 6.95 kN, grease limiting speed 8,000 r/min, oil 9,400 r/min, mass about 643 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU308 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU308 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,000 r/min grease / 9,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu308", "＊＊nu308", "NU308", "NU308-NTN" ], "locale_variants": {} }, { "sku": "NU308EA", "brand": "NTN", "manufacturer_designation": "NTN NU308EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 81.5, "fatigue_load_limit_kN": 9.95, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 658, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 40 mm shaft NTN supplies NU308EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 7,200 r/min on grease and 10,200 r/min on oil. Numbering ties NU308EA to its envelope: type code NU, series NU300, 40 mm bore; the 90×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 25.0 mm radial section ((90−40)/2) frames the roller complement; capacity per millimetre of bore is about 2.5 kN/mm before application factors. Rating life at 98.5 kN C assumes clean oil and adequate film; the 9.95 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 40 mm shaft.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU308EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98.5/81.5 kN pair here belongs to NU308EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The 98.5/81.5 kN ratings, 9.95 kN Pu and 658 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU308EA?", "a": "NU308EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 81.5 kN, Pu 9.95 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 658 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU308EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU308EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu308ea", "＊nu308ea", "NU308EA" ], "locale_variants": {} }, { "sku": "NUP2308", "brand": "NTN", "manufacturer_designation": "NTN NUP2308", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 91.5, "static_load_kN": 88, "fatigue_load_limit_kN": 10.7, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 932, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2308 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 40×90×33 mm ISO 15 envelope. Numbering ties NUP2308 to its envelope: type code NUP, series NUP2300, 40 mm bore; the 90×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 25.0 mm radial section ((90−40)/2) frames the roller complement; capacity per millimetre of bore is about 2.3 kN/mm before application factors. Mass 932 g for the 40×90×33 mm NUP2308 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 40 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2308.", "If the shaft must be located both ways, do not use NUP2308 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NUP2308 with a deep-groove ball bearing on rating alone: line contact gives 91.5 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Open NUP2308 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "The 25.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The 91.5/88 kN ratings, 10.7 kN Pu and 932 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2308?", "a": "NUP2308 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 91.5 kN, C0 88 kN, Pu 10.7 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 932 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2308 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2308 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2308-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2308", "＊＊nup2308", "NUP2308" ], "locale_variants": {} }, { "sku": "NUP2308EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2308EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 122, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 9000, "weight_g": 952, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2308EA on the 40×90 mm envelope, 33 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 6,400 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 90 mm OD and 33 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 6,400 r/min grease and 9,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 40 mm bore. Mass 952 g for the 40×90×33 mm NUP2308EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2308EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2308EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 135/122 kN pair here belongs to NUP2308EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NUP2308EA with a deep-groove ball bearing on rating alone: line contact gives 135 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NUP2308EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 135/122 kN ratings, 14.9 kN Pu and 952 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2308EA?", "a": "NUP2308EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 135 kN, C0 122 kN, Pu 14.9 kN, grease limiting speed 6,400 r/min, oil 9,000 r/min, mass about 952 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2308EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2308EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2308ea", "＊nup2308ea", "NUP2308EA" ], "locale_variants": {} }, { "sku": "NUP308", "brand": "NTN", "manufacturer_designation": "NTN NUP308", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 65, "static_load_kN": 57, "fatigue_load_limit_kN": 6.95, "limiting_speed_rpm": 8000, "max_rpm": 8000, "speed_oil_rpm": 9400, "weight_g": 643, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP308 appears as a 40 mm bore single-row cylindrical roller bearing (65 kN C / 57 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP308 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 9,400 r/min with oil versus 8,000 r/min with grease (a 1,400 r/min band), lubrication choice for NUP308 is a thermal decision, not just a sealing one. Mass 643 g for the 40×90×23 mm NUP308 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP308; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP308.", "Do not replace NUP308 with a deep-groove ball bearing on rating alone: line contact gives 65 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 65/57 kN pair here belongs to NUP308 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "Grease limiting speed 8,000 r/min and oil 9,400 r/min are different limits for NUP308: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 65/57 kN ratings, 6.95 kN Pu and 643 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP308 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP308?", "a": "NUP308 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 65 kN, C0 57 kN, Pu 6.95 kN, grease limiting speed 8,000 r/min, oil 9,400 r/min, mass about 643 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP308 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP308 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP308 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP308?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 53.5 mm, Ew 77.5 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,000 r/min grease / 9,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP308-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup308", "＊＊nup308", "NUP308" ], "locale_variants": {} }, { "sku": "NUP308EA", "brand": "NTN", "manufacturer_designation": "NTN NUP308EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 81.5, "fatigue_load_limit_kN": 9.95, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 10200, "weight_g": 658, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP308EA on the 40×90 mm envelope, 23 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 7,200 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP308EA floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP308EA designation when purchasing. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 40 mm shaft.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP308EA.", "If the shaft must be located both ways, do not use NUP308EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NUP rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "If the shaft must be located both ways, do not use NUP308EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The 98.5/81.5 kN ratings, 9.95 kN Pu and 658 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP308EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP308EA?", "a": "NUP308EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 81.5 kN, Pu 9.95 kN, grease limiting speed 7,200 r/min, oil 10,200 r/min, mass about 658 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP308EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP308EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP308EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52 mm, Ew 80 mm. The nominal bore/OD remain 40/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 10,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP308EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup308ea", "＊nup308ea", "NUP308EA" ], "locale_variants": {} }, { "sku": "N408", "brand": "NTN", "manufacturer_designation": "NTN N408", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 89, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N408 denotes a 40×110×27 mm (1.575 × 4.331 × 1.063 in) cylindrical roller bearing in the N400 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N408 floats or locates; the numeric remainder is the ISO 15 series and 40 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N408 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 10.9 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.84 (89/106 kN) shows the high-static-capacity proportioning of this 40 mm bore. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N408.", "Grease limiting speed 5,700 r/min and oil 6,700 r/min are different limits for N408: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 27 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The 35.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 106/89 kN ratings, 10.9 kN Pu and 1270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N408 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N408?", "a": "N408 is an NTN N single-row cylindrical roller bearing to ISO 15: 40 mm bore, 110 mm OD and 27 mm width (1.575 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 106 kN, C0 89 kN, Pu 10.9 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1270 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N408 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N408 is supplied in the standard open execution shown in the table." }, { "q": "Can N408 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N408?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58 mm, Ew 92 mm. The nominal bore/OD remain 40/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N408", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n408", "N408" ], "locale_variants": {} }, { "sku": "NF408", "brand": "NTN", "manufacturer_designation": "NTN NF408", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 89, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF408 appears as a 40 mm bore single-row cylindrical roller bearing (106 kN C / 89 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF408 reads as NF (one rib on each ring), ISO 15 series, and bore 40 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NF408 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 2.6 kN-per-mm-bore figure (106 kN over 40 mm) lets a NF408 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 40 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF408.", "The NF rib arrangement is not interchangeable with another prefix on the same 40 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 110×27 mm envelope matches.", "The 35.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "Do not replace NF408 with a deep-groove ball bearing on rating alone: line contact gives 106 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NF408 with a deep-groove ball bearing on rating alone: line contact gives 106 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 106/89 kN ratings, 10.9 kN Pu and 1270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF408 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF408?", "a": "NF408 is an NTN NF single-row cylindrical roller bearing to ISO 15: 40 mm bore, 110 mm OD and 27 mm width (1.575 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 106 kN, C0 89 kN, Pu 10.9 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1270 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF408 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF408 is supplied in the standard open execution shown in the table." }, { "q": "Can NF408 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF408?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58 mm, Ew 92 mm. The nominal bore/OD remain 40/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF408", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf408", "NF408" ], "locale_variants": {} }, { "sku": "NJ408", "brand": "NTN", "manufacturer_designation": "NTN NJ408", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 89, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ408 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 40×110×27 mm ISO 15 envelope. Numbering ties NJ408 to its envelope: type code NJ, series NJ400, 40 mm bore; the 110×27 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NJ408 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 2.6 kN-per-mm-bore figure (106 kN over 40 mm) lets a NJ408 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NJ408; an oversized radius locks the ring on its face and tilts the 27 mm-wide seat.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ408.", "Open NJ408 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "Open NJ408 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 40 mm bore share bore but not OD/width; check the full NJ400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 106/89 kN ratings, 10.9 kN Pu and 1270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ408 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ408?", "a": "NJ408 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 40 mm bore, 110 mm OD and 27 mm width (1.575 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 106 kN, C0 89 kN, Pu 10.9 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1270 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ408 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ408 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ408 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ408?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58 mm, Ew 92 mm. The nominal bore/OD remain 40/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ408-M", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj408", "NJ408" ], "locale_variants": {} }, { "sku": "NU408", "brand": "NTN", "manufacturer_designation": "NTN NU408", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 89, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU408 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 106 kN dynamic rating in the 40 mm bore. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 40 mm (00–03 use the 10/12/15/17 exception table). The 35.0 mm radial section ((110−40)/2) frames the roller complement; capacity per millimetre of bore is about 2.6 kN/mm before application factors. Selection arithmetic: Pu 10.9 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.84 (89/106 kN) shows the high-static-capacity proportioning of this 40 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU408.", "The 35.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "Open NU408 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 40 mm contact.", "If the shaft must be located both ways, do not use NU408 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 35.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "The 106/89 kN ratings, 10.9 kN Pu and 1270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU408 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU408?", "a": "NU408 is an NTN NU single-row cylindrical roller bearing to ISO 15: 40 mm bore, 110 mm OD and 27 mm width (1.575 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 106 kN, C0 89 kN, Pu 10.9 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1270 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU408 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU408 is supplied in the standard open execution shown in the table." }, { "q": "Can NU408 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU408?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58 mm, Ew 92 mm. The nominal bore/OD remain 40/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU408-M", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu408", "NU408" ], "locale_variants": {} }, { "sku": "NUP408", "brand": "NTN", "manufacturer_designation": "NTN NUP408", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 89, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP408 is the heavy (04) section of the NTN NUP400 dimension series for a 40 mm shaft — 106 kN of basic dynamic capacity in a 1270 g, open bearing. Numbering ties NUP408 to its envelope: type code NUP, series NUP400, 40 mm bore; the 110×27 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 35.0 mm radial section ((110−40)/2) frames the roller complement; capacity per millimetre of bore is about 2.6 kN/mm before application factors. The 2.6 kN-per-mm-bore figure (106 kN over 40 mm) lets a NUP408 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 40 mm shaft.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP408.", "The 27 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "The 27 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 40 mm inner ring.", "Grease limiting speed 5,700 r/min and oil 6,700 r/min are different limits for NUP408: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 35.0 mm section at 40 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "The 106/89 kN ratings, 10.9 kN Pu and 1270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP408 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP408?", "a": "NUP408 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 110 mm OD and 27 mm width (1.575 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 106 kN, C0 89 kN, Pu 10.9 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1270 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP408 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP408 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP408 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP408?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58 mm, Ew 92 mm. The nominal bore/OD remain 40/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP408", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup408", "NUP408" ], "locale_variants": {} }, { "sku": "N1009", "brand": "NTN", "manufacturer_designation": "NTN N1009", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 34, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 9900, "max_rpm": 9900, "speed_oil_rpm": 12000, "weight_g": 276, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1009 appears as a 45 mm bore single-row cylindrical roller bearing (34.5 kN C / 34 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate N states which ring carries the ribs, which determines whether N1009 floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N1009 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N1009 non-locating position preloads the bearing when the shaft grows.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N1009.", "The 16 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 15.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 34.5/34 kN pair here belongs to N1009 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 34.5/34 kN ratings, 4.1 kN Pu and 276 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1009 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1009?", "a": "N1009 is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 75 mm OD and 16 mm width (1.772 × 2.953 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 34 kN, Pu 4.1 kN, grease limiting speed 9,900 r/min, oil 12,000 r/min, mass about 276 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1009 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1009 is supplied in the standard open execution shown in the table." }, { "q": "Can N1009 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1009?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52.5 mm, Ew 67.5 mm. The nominal bore/OD remain 45/75 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,900 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1009", "N1009" ], "locale_variants": {} }, { "sku": "NJ1009", "brand": "NTN", "manufacturer_designation": "NTN NJ1009", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 34, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 9900, "max_rpm": 9900, "speed_oil_rpm": 12000, "weight_g": 276, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1009 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 34.5 kN dynamic rating in the 45 mm bore. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 75 mm OD and 16 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 9,900 r/min grease and 12,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 45 mm bore. Rating life at 34.5 kN C assumes clean oil and adequate film; the 4.1 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NJ1009; an oversized radius locks the ring on its face and tilts the 16 mm-wide seat.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ1009.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1009 skids at 9,900 r/min and fails by smearing long before L10 fatigue.", "Open NJ1009 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NJ1009 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 34.5/34 kN ratings, 4.1 kN Pu and 276 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1009 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1009?", "a": "NJ1009 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 75 mm OD and 16 mm width (1.772 × 2.953 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 34 kN, Pu 4.1 kN, grease limiting speed 9,900 r/min, oil 12,000 r/min, mass about 276 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1009 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1009 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1009 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1009?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52.5 mm, Ew 67.5 mm. The nominal bore/OD remain 45/75 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,900 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1009-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1009", "NJ1009" ], "locale_variants": {} }, { "sku": "NN3009", "brand": "NTN", "manufacturer_designation": "NTN NN3009", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 57.5, "static_load_kN": 68.5, "fatigue_load_limit_kN": 8.35, "limiting_speed_rpm": 8800, "max_rpm": 8800, "speed_oil_rpm": 10000, "weight_g": 405, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NN3009 on the 45×75 mm envelope, 23 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 8,800 r/min. Digit by digit, NN3009 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NN3009 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 405 g for the 45×75×23 mm NN3009 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 45 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3009.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 57.5/68.5 kN pair here belongs to NN3009 as printed, not to the bare size.", "Grease limiting speed 8,800 r/min and oil 10,000 r/min are different limits for NN3009: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NN3009 with a deep-groove ball bearing on rating alone: line contact gives 57.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 57.5/68.5 kN ratings, 8.35 kN Pu and 405 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3009 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3009?", "a": "NN3009 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 45 mm bore, 75 mm OD and 23 mm width (1.772 × 2.953 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.5 kN, C0 68.5 kN, Pu 8.35 kN, grease limiting speed 8,800 r/min, oil 10,000 r/min, mass about 405 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3009 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3009 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3009?", "a": "NN3009 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN3009?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 67.55 mm. The nominal bore/OD remain 45/75 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,800 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3009", "NN3009" ], "locale_variants": {} }, { "sku": "NN3009K", "brand": "NTN", "manufacturer_designation": "NTN NN3009K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 57.5, "static_load_kN": 68.5, "fatigue_load_limit_kN": 8.35, "limiting_speed_rpm": 8800, "max_rpm": 8800, "speed_oil_rpm": 10000, "weight_g": 393, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3009K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 57.5 kN dynamic rating in the 45 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3009K floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3009K. The 1.3 kN-per-mm-bore figure (57.5 kN over 45 mm) lets a NN3009K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 45 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3009K.", "The 15.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 57.5/68.5 kN pair here belongs to NN3009K as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 75 mm race brinells and releases as vibration within hours.", "The 57.5/68.5 kN ratings, 8.35 kN Pu and 393 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3009K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3009K?", "a": "NN3009K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 45 mm bore, 75 mm OD and 23 mm width (1.772 × 2.953 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.5 kN, C0 68.5 kN, Pu 8.35 kN, grease limiting speed 8,800 r/min, oil 10,000 r/min, mass about 393 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3009K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3009K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3009K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3009K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3009 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN3009K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 67.55 mm. The nominal bore/OD remain 45/75 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,800 r/min grease / 10,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3009K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3009k", "NN3009K" ], "locale_variants": {} }, { "sku": "NU1009", "brand": "NTN", "manufacturer_designation": "NTN NU1009", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 34, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 9900, "max_rpm": 9900, "speed_oil_rpm": 12000, "weight_g": 276, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU1009 on the 45×75 mm envelope, 16 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 9,900 r/min. Digit by digit, NU1009 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 16 mm width and 15.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 4.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.99 (34/34.5 kN) shows the high-static-capacity proportioning of this 45 mm bore. Heat the inner ring to max 120 °C for the 45 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU1009.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 15.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NU1009 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 34.5/34 kN ratings, 4.1 kN Pu and 276 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1009 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1009?", "a": "NU1009 is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 75 mm OD and 16 mm width (1.772 × 2.953 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 34 kN, Pu 4.1 kN, grease limiting speed 9,900 r/min, oil 12,000 r/min, mass about 276 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1009 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1009 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1009 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1009?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52.5 mm, Ew 67.5 mm. The nominal bore/OD remain 45/75 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,900 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1009-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1009", "NU1009" ], "locale_variants": {} }, { "sku": "NUP1009", "brand": "NTN", "manufacturer_designation": "NTN NUP1009", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 34, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 9900, "max_rpm": 9900, "speed_oil_rpm": 12000, "weight_g": 276, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP1009 on the 45×75 mm envelope, 16 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 9,900 r/min. Digit by digit, NUP1009 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NUP1009 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 45 mm (1.772 in) bore and 75 mm (2.953 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 16 mm-wide ring. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP1009.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NUP1009 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 75 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 34.5/34 kN ratings, 4.1 kN Pu and 276 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1009 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1009?", "a": "NUP1009 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 75 mm OD and 16 mm width (1.772 × 2.953 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 34 kN, Pu 4.1 kN, grease limiting speed 9,900 r/min, oil 12,000 r/min, mass about 276 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1009 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1009 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1009 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1009?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52.5 mm, Ew 67.5 mm. The nominal bore/OD remain 45/75 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,900 r/min grease / 12,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=147", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1009", "NUP1009" ], "locale_variants": {} }, { "sku": "N209", "brand": "NTN", "manufacturer_designation": "NTN N209", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 47, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 8400, "max_rpm": 8400, "speed_oil_rpm": 9900, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N209 on the 45×85 mm envelope, 19 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 8,400 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N209 floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. The 20.0 mm radial section ((85−45)/2) frames the roller complement; capacity per millimetre of bore is about 1.1 kN/mm before application factors. The 1.1 kN-per-mm-bore figure (51 kN over 45 mm) lets a N209 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of N209; an oversized radius locks the ring on its face and tilts the 19 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N209.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 85 mm race brinells and releases as vibration within hours.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N209 skids at 8,400 r/min and fails by smearing long before L10 fatigue.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "The 51/47 kN ratings, 5.7 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N209?", "a": "N209 is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51 kN, C0 47 kN, Pu 5.7 kN, grease limiting speed 8,400 r/min, oil 9,900 r/min, mass about 423 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N209 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N209 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,400 r/min grease / 9,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N209-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n209", "＊＊n209", "N209" ], "locale_variants": {} }, { "sku": "N209EA", "brand": "NTN", "manufacturer_designation": "NTN N209EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74.5, "static_load_kN": 66.5, "fatigue_load_limit_kN": 8.1, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10800, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies N209EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 7,600 r/min on grease and 10,800 r/min on oil. Numbering ties N209EA to its envelope: type code N, series N200, 45 mm bore; the 85×19 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 10,800 r/min with oil versus 7,600 r/min with grease (a 3,200 r/min band), lubrication choice for N209EA is a thermal decision, not just a sealing one. Selection arithmetic: Pu 8.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.89 (66.5/74.5 kN) shows the high-static-capacity proportioning of this 45 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N209EA.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N209EA.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open N209EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "Grease limiting speed 7,600 r/min and oil 10,800 r/min are different limits for N209EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 74.5/66.5 kN ratings, 8.1 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N209EA?", "a": "N209EA is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 74.5 kN, C0 66.5 kN, Pu 8.1 kN, grease limiting speed 7,600 r/min, oil 10,800 r/min, mass about 423 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N209EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N209EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n209ea", "＊n209ea", "N209EA" ], "locale_variants": {} }, { "sku": "N2209", "brand": "NTN", "manufacturer_designation": "NTN N2209", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 68, "fatigue_load_limit_kN": 8.25, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2209 is the wide (22) section of the NTN N2200 dimension series for a 45 mm shaft — 68 kN of basic dynamic capacity in a 520 g, open bearing. Numbering ties N2209 to its envelope: type code N, series N2200, 45 mm bore; the 85×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 68 kN and C0 68 kN (C0/C ≈ 1.00) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Speed ratio check: limiting 7,600 r/min is .84 of the 9,000 r/min oil value for N2209; grease-churn heating closes that gap as fill quantity rises. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2209.", "Grease limiting speed 7,600 r/min and oil 9,000 r/min are different limits for N2209: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The N rib arrangement is not interchangeable with another prefix on the same 45 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 85×23 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 68/68 kN pair here belongs to N2209 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2209 skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "The 68/68 kN ratings, 8.25 kN Pu and 520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2209?", "a": "N2209 is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 68 kN, C0 68 kN, Pu 8.25 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2209 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2209 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2209", "＊＊n2209", "N2209" ], "locale_variants": {} }, { "sku": "N2209EA", "brand": "NTN", "manufacturer_designation": "NTN N2209EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90, "static_load_kN": 84.5, "fatigue_load_limit_kN": 10.3, "limiting_speed_rpm": 6800, "max_rpm": 6800, "speed_oil_rpm": 9600, "weight_g": 533, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2209EA appears as a 45 mm bore single-row cylindrical roller bearing (90 kN C / 84.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N2209EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 54.5 mm and Ew 76.5 mm — the envelope inside the 45/85 mm bore/OD where the rollers actually run. Thermal planning around the 6,800 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 9,600 r/min for continuously high-duty 45 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 45 mm shaft.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2209EA.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2209EA skids at 6,800 r/min and fails by smearing long before L10 fatigue.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The N rib arrangement is not interchangeable with another prefix on the same 45 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 85×23 mm envelope matches.", "The 90/84.5 kN ratings, 10.3 kN Pu and 533 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2209EA?", "a": "N2209EA is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 90 kN, C0 84.5 kN, Pu 10.3 kN, grease limiting speed 6,800 r/min, oil 9,600 r/min, mass about 533 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2209EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2209EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,800 r/min grease / 9,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2209ea", "＊n2209ea", "N2209EA" ], "locale_variants": {} }, { "sku": "NF209", "brand": "NTN", "manufacturer_designation": "NTN NF209", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 47, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 8400, "max_rpm": 8400, "speed_oil_rpm": 9900, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF209 denotes a 45×85×19 mm (1.772 × 3.346 × 0.748 in) cylindrical roller bearing in the NF200 family, a pressed sheet-steel cage. Digit by digit, NF209 reads as NF (one rib on each ring), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 19 mm width and 20.0 mm section put the NF200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 8,400 r/min is .85 of the 9,900 r/min oil value for NF209; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF209 non-locating position preloads the bearing when the shaft grows.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF209.", "If the shaft must be located both ways, do not use NF209 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 85 mm race brinells and releases as vibration within hours.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "Open NF209 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 51/47 kN ratings, 5.7 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF209?", "a": "NF209 is an NTN NF single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51 kN, C0 47 kN, Pu 5.7 kN, grease limiting speed 8,400 r/min, oil 9,900 r/min, mass about 423 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF209 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF209 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,400 r/min grease / 9,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf209", "＊＊nf209", "NF209" ], "locale_variants": {} }, { "sku": "NF209EA", "brand": "NTN", "manufacturer_designation": "NTN NF209EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74.5, "static_load_kN": 66.5, "fatigue_load_limit_kN": 8.1, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10800, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF209EA appears as a 45 mm bore single-row cylindrical roller bearing (74.5 kN C / 66.5 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF209EA reads as NF (one rib on each ring), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 54.5 mm and Ew 76.5 mm — the envelope inside the 45/85 mm bore/OD where the rollers actually run. Speed ratio check: limiting 7,600 r/min is .70 of the 10,800 r/min oil value for NF209EA; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 45 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF209EA.", "Do not replace NF209EA with a deep-groove ball bearing on rating alone: line contact gives 74.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 74.5/66.5 kN pair here belongs to NF209EA as printed, not to the bare size.", "Open NF209EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The NF rib arrangement is not interchangeable with another prefix on the same 45 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 85×19 mm envelope matches.", "The 74.5/66.5 kN ratings, 8.1 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF209EA?", "a": "NF209EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 74.5 kN, C0 66.5 kN, Pu 8.1 kN, grease limiting speed 7,600 r/min, oil 10,800 r/min, mass about 423 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF209EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF209EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf209ea", "＊nf209ea", "NF209EA" ], "locale_variants": {} }, { "sku": "NF2209EA", "brand": "NTN", "manufacturer_designation": "NTN NF2209EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90, "static_load_kN": 84.5, "fatigue_load_limit_kN": 10.3, "limiting_speed_rpm": 6800, "max_rpm": 6800, "speed_oil_rpm": 9600, "weight_g": 533, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies NF2209EA: one integral rib on each ring; the open execution is rated 6,800 r/min on grease and 9,600 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 85 mm OD and 23 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NF2209EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 45 mm (1.772 in) bore and 85 mm (3.346 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF2209EA.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2209EA.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NF2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NF2209EA with a deep-groove ball bearing on rating alone: line contact gives 90 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NF2209EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NF2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 90/84.5 kN ratings, 10.3 kN Pu and 533 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2209EA?", "a": "NF2209EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 90 kN, C0 84.5 kN, Pu 10.3 kN, grease limiting speed 6,800 r/min, oil 9,600 r/min, mass about 533 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2209EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2209EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,800 r/min grease / 9,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2209ea", "＊nf2209ea", "NF2209EA" ], "locale_variants": {} }, { "sku": "NJ209", "brand": "NTN", "manufacturer_designation": "NTN NJ209", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 47, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 8400, "max_rpm": 8400, "speed_oil_rpm": 9900, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies NJ209: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 8,400 r/min on grease and 9,900 r/min on oil. Digit by digit, NJ209 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 20.0 mm radial section ((85−45)/2) frames the roller complement; capacity per millimetre of bore is about 1.1 kN/mm before application factors. The 1.1 kN-per-mm-bore figure (51 kN over 45 mm) lets a NJ209 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 45 mm shaft.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ209.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ209 skids at 8,400 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ209 skids at 8,400 r/min and fails by smearing long before L10 fatigue.", "Do not replace NJ209 with a deep-groove ball bearing on rating alone: line contact gives 51 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "The 51/47 kN ratings, 5.7 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ209?", "a": "NJ209 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51 kN, C0 47 kN, Pu 5.7 kN, grease limiting speed 8,400 r/min, oil 9,900 r/min, mass about 423 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ209 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ209 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,400 r/min grease / 9,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ209-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj209", "＊＊nj209", "NJ209" ], "locale_variants": {} }, { "sku": "NJ209EA", "brand": "NTN", "manufacturer_designation": "NTN NJ209EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74.5, "static_load_kN": 66.5, "fatigue_load_limit_kN": 8.1, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10800, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ209EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 74.5 kN dynamic rating in the 45 mm bore. Digit by digit, NJ209EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 7,600 r/min grease and 10,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 45 mm bore. The 1.7 kN-per-mm-bore figure (74.5 kN over 45 mm) lets a NJ209EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 45 mm shaft.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ209EA.", "Open NJ209EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 74.5/66.5 kN pair here belongs to NJ209EA as printed, not to the bare size.", "The NJ rib arrangement is not interchangeable with another prefix on the same 45 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 85×19 mm envelope matches.", "If the shaft must be located both ways, do not use NJ209EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 74.5/66.5 kN ratings, 8.1 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ209EA?", "a": "NJ209EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 74.5 kN, C0 66.5 kN, Pu 8.1 kN, grease limiting speed 7,600 r/min, oil 10,800 r/min, mass about 423 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ209EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ209EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj209ea", "＊nj209ea", "NJ209EA" ], "locale_variants": {} }, { "sku": "NJ2209", "brand": "NTN", "manufacturer_designation": "NTN NJ2209", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 68, "fatigue_load_limit_kN": 8.25, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2209 appears as a 45 mm bore single-row cylindrical roller bearing (68 kN C / 68 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ2209 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 20.0 mm radial section ((85−45)/2) frames the roller complement; capacity per millimetre of bore is about 1.5 kN/mm before application factors. Thermal planning around the 7,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 9,000 r/min for continuously high-duty 45 mm positions. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 45 mm shaft.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2209.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 7,600 r/min and oil 9,000 r/min are different limits for NJ2209: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The 68/68 kN ratings, 8.25 kN Pu and 520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2209?", "a": "NJ2209 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 68 kN, C0 68 kN, Pu 8.25 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2209 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2209 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2209-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2209", "＊＊nj2209", "NJ2209" ], "locale_variants": {} }, { "sku": "NJ2209EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2209EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90, "static_load_kN": 84.5, "fatigue_load_limit_kN": 10.3, "limiting_speed_rpm": 6800, "max_rpm": 6800, "speed_oil_rpm": 9600, "weight_g": 533, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2209EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 90 kN dynamic rating in the 45 mm bore. Numbering ties NJ2209EA to its envelope: type code NJ, series NJ2200, 45 mm bore; the 85×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 90 kN and C0 84.5 kN (C0/C ≈ 0.94) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 45 mm (1.772 in) bore and 85 mm (3.346 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 45 mm shaft.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2209EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 85 mm race brinells and releases as vibration within hours.", "Grease limiting speed 6,800 r/min and oil 9,600 r/min are different limits for NJ2209EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 85 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2209EA skids at 6,800 r/min and fails by smearing long before L10 fatigue.", "The 90/84.5 kN ratings, 10.3 kN Pu and 533 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2209EA?", "a": "NJ2209EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 90 kN, C0 84.5 kN, Pu 10.3 kN, grease limiting speed 6,800 r/min, oil 9,600 r/min, mass about 533 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2209EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2209EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,800 r/min grease / 9,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2209ea", "＊nj2209ea", "NJ2209EA" ], "locale_variants": {} }, { "sku": "NU209-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU209", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 47, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 8400, "max_rpm": 8400, "speed_oil_rpm": 9900, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU209 is the standard section of the NTN NU200 dimension series for a 45 mm shaft — 51 kN of basic dynamic capacity in a 423 g, open bearing. Numbering ties NU209 to its envelope: type code NU, series NU200, 45 mm bore; the 85×19 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 20.0 mm radial section ((85−45)/2) frames the roller complement; capacity per millimetre of bore is about 1.1 kN/mm before application factors. The 45 mm (1.772 in) bore and 85 mm (3.346 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 19 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU209.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 85 mm race brinells and releases as vibration within hours.", "The NU rib arrangement is not interchangeable with another prefix on the same 45 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 85×19 mm envelope matches.", "The 19 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 19 mm-wide cavity.", "The 51/47 kN ratings, 5.7 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU209?", "a": "NU209 is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51 kN, C0 47 kN, Pu 5.7 kN, grease limiting speed 8,400 r/min, oil 9,900 r/min, mass about 423 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU209 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU209 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,400 r/min grease / 9,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu209", "＊＊nu209", "NU209", "NU209-NTN" ], "locale_variants": {} }, { "sku": "NU209EA", "brand": "NTN", "manufacturer_designation": "NTN NU209EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74.5, "static_load_kN": 66.5, "fatigue_load_limit_kN": 8.1, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10800, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU209EA denotes a 45×85×19 mm (1.772 × 3.346 × 0.748 in) cylindrical roller bearing in the NU200 family, the EA high-capacity pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 85 mm OD and 19 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 45 mm shaft.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU209EA.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU209EA skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 74.5/66.5 kN pair here belongs to NU209EA as printed, not to the bare size.", "The 74.5/66.5 kN ratings, 8.1 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU209EA?", "a": "NU209EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 74.5 kN, C0 66.5 kN, Pu 8.1 kN, grease limiting speed 7,600 r/min, oil 10,800 r/min, mass about 423 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU209EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU209EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu209ea", "＊nu209ea", "NU209EA" ], "locale_variants": {} }, { "sku": "NU2209-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2209", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 68, "fatigue_load_limit_kN": 8.25, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2209 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 45×85×23 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 45 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NU2209 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NU2209 as a pure radial bearing: keep P below 68 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU2209; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2209.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2209 skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 68/68 kN ratings, 8.25 kN Pu and 520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2209?", "a": "NU2209 is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 68 kN, C0 68 kN, Pu 8.25 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2209 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2209 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2209", "＊＊nu2209", "NU2209", "NU2209-NTN" ], "locale_variants": {} }, { "sku": "NU2209EA", "brand": "NTN", "manufacturer_designation": "NTN NU2209EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90, "static_load_kN": 84.5, "fatigue_load_limit_kN": 10.3, "limiting_speed_rpm": 6800, "max_rpm": 6800, "speed_oil_rpm": 9600, "weight_g": 533, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2209EA on the 45×85 mm envelope, 23 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 6,800 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2209EA floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. The 20.0 mm radial section ((85−45)/2) frames the roller complement; capacity per millimetre of bore is about 2.0 kN/mm before application factors. Rating life at 90 kN C assumes clean oil and adequate film; the 10.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2209EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 85 mm race brinells and releases as vibration within hours.", "The NU rib arrangement is not interchangeable with another prefix on the same 45 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 85×23 mm envelope matches.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 20.0 mm section at 45 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The 90/84.5 kN ratings, 10.3 kN Pu and 533 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2209EA?", "a": "NU2209EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 90 kN, C0 84.5 kN, Pu 10.3 kN, grease limiting speed 6,800 r/min, oil 9,600 r/min, mass about 533 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2209EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2209EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,800 r/min grease / 9,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2209ea", "＊nu2209ea", "NU2209EA" ], "locale_variants": {} }, { "sku": "NUP209", "brand": "NTN", "manufacturer_designation": "NTN NUP209", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 47, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 8400, "max_rpm": 8400, "speed_oil_rpm": 9900, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP209 denotes a 45×85×19 mm (1.772 × 3.346 × 0.748 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. Numbering ties NUP209 to its envelope: type code NUP, series NUP200, 45 mm bore; the 85×19 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 8,400 r/min grease and 9,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 45 mm bore. Speed ratio check: limiting 8,400 r/min is .85 of the 9,900 r/min oil value for NUP209; grease-churn heating closes that gap as fill quantity rises. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP209.", "Open NUP209 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 19 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 85 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NUP209 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 51/47 kN ratings, 5.7 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP209?", "a": "NUP209 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51 kN, C0 47 kN, Pu 5.7 kN, grease limiting speed 8,400 r/min, oil 9,900 r/min, mass about 423 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP209 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP209 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,400 r/min grease / 9,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP209-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup209", "＊＊nup209", "NUP209" ], "locale_variants": {} }, { "sku": "NUP209EA", "brand": "NTN", "manufacturer_designation": "NTN NUP209EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74.5, "static_load_kN": 66.5, "fatigue_load_limit_kN": 8.1, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 10800, "weight_g": 423, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP209EA is the standard section of the NTN NUP200 dimension series for a 45 mm shaft — 74.5 kN of basic dynamic capacity in a 423 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP209EA floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 7,600 r/min grease and 10,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 45 mm bore. The 45 mm (1.772 in) bore and 85 mm (3.346 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 19 mm-wide ring. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 45 mm shaft.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP209EA.", "If the shaft must be located both ways, do not use NUP209EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NUP209EA with a deep-groove ball bearing on rating alone: line contact gives 74.5 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 74.5/66.5 kN pair here belongs to NUP209EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use NUP209EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 74.5/66.5 kN ratings, 8.1 kN Pu and 423 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP209EA?", "a": "NUP209EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 19 mm width (1.772 × 3.346 × 0.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 74.5 kN, C0 66.5 kN, Pu 8.1 kN, grease limiting speed 7,600 r/min, oil 10,800 r/min, mass about 423 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP209EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP209EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 10,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup209ea", "＊nup209ea", "NUP209EA" ], "locale_variants": {} }, { "sku": "NUP2209", "brand": "NTN", "manufacturer_designation": "NTN NUP2209", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 68, "fatigue_load_limit_kN": 8.25, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2209 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 68 kN dynamic rating in the 45 mm bore. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 85 mm OD and 23 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP2209 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 7,600 r/min is .84 of the 9,000 r/min oil value for NUP2209; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 45 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2209.", "Do not replace NUP2209 with a deep-groove ball bearing on rating alone: line contact gives 68 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NUP2209 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NUP2209 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 68/68 kN ratings, 8.25 kN Pu and 520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2209 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2209?", "a": "NUP2209 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 68 kN, C0 68 kN, Pu 8.25 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2209 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2209 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2209 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2209?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 55 mm, Ew 75 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2209-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2209", "＊＊nup2209", "NUP2209" ], "locale_variants": {} }, { "sku": "NUP2209EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2209EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90, "static_load_kN": 84.5, "fatigue_load_limit_kN": 10.3, "limiting_speed_rpm": 6800, "max_rpm": 6800, "speed_oil_rpm": 9600, "weight_g": 533, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2209EA is the wide (22) section of the NTN NUP2200 dimension series for a 45 mm shaft — 90 kN of basic dynamic capacity in a 533 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 85 mm OD and 23 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NUP2209EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 6,800 r/min is .71 of the 9,600 r/min oil value for NUP2209EA; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2209EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2209EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 90/84.5 kN pair here belongs to NUP2209EA as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2209EA skids at 6,800 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 6,800 r/min and oil 9,600 r/min are different limits for NUP2209EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NUP2209EA with a deep-groove ball bearing on rating alone: line contact gives 90 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 90/84.5 kN ratings, 10.3 kN Pu and 533 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2209EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2209EA?", "a": "NUP2209EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 90 kN, C0 84.5 kN, Pu 10.3 kN, grease limiting speed 6,800 r/min, oil 9,600 r/min, mass about 533 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2209EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2209EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2209EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 54.5 mm, Ew 76.5 mm. The nominal bore/OD remain 45/85 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,800 r/min grease / 9,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2209EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2209ea", "＊nup2209ea", "NUP2209EA" ], "locale_variants": {} }, { "sku": "N2309", "brand": "NTN", "manufacturer_designation": "NTN N2309", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 110, "static_load_kN": 104, "fatigue_load_limit_kN": 12.7, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 1240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2309 denotes a 45×100×36 mm (1.772 × 3.937 × 1.417 in) cylindrical roller bearing in the N2300 family, a pressed sheet-steel cage. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 100 mm OD and 36 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats N2309 as a pure radial bearing: keep P below 110 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of N2309; an oversized radius locks the ring on its face and tilts the 36 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2309.", "The 27.5 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 36 mm-wide cavity.", "Open N2309 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "Open N2309 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 110/104 kN pair here belongs to N2309 as printed, not to the bare size.", "The 110/104 kN ratings, 12.7 kN Pu and 1240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2309?", "a": "N2309 is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 104 kN, Pu 12.7 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 1240 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2309 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2309 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2309", "＊＊n2309", "N2309" ], "locale_variants": {} }, { "sku": "N2309EA", "brand": "NTN", "manufacturer_designation": "NTN N2309EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 153, "fatigue_load_limit_kN": 18.7, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 8200, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2309EA on the 45×100 mm envelope, 36 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,700 r/min. Numbering ties N2309EA to its envelope: type code N, series N2300, 45 mm bore; the 100×36 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N2309EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 162 kN C assumes clean oil and adequate film; the 18.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 45 mm shaft.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2309EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 162/153 kN pair here belongs to N2309EA as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 162/153 kN pair here belongs to N2309EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 162/153 kN ratings, 18.7 kN Pu and 1300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2309EA?", "a": "N2309EA is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 153 kN, Pu 18.7 kN, grease limiting speed 5,700 r/min, oil 8,200 r/min, mass about 1300 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2309EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2309EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2309ea", "＊n2309ea", "N2309EA" ], "locale_variants": {} }, { "sku": "N309", "brand": "NTN", "manufacturer_designation": "NTN N309", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 8400, "weight_g": 857, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies N309: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 7,200 r/min on grease and 8,400 r/min on oil. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 45 mm (00–03 use the 10/12/15/17 exception table). The 25 mm width and 27.5 mm section put the N300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 45 mm shaft.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N309.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N309 skids at 7,200 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 27.5 mm section at 45 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 25 mm-wide cavity.", "Open N309 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 82/71 kN ratings, 8.65 kN Pu and 857 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N309?", "a": "N309 is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 7,200 r/min, oil 8,400 r/min, mass about 857 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N309 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N309 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 8,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N309-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n309", "＊＊n309", "N309" ], "locale_variants": {} }, { "sku": "N309EA", "brand": "NTN", "manufacturer_designation": "NTN N309EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 9100, "weight_g": 865, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N309EA is the standard section of the NTN N300 dimension series for a 45 mm shaft — 115 kN of basic dynamic capacity in a 865 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 100 mm OD and 25 mm width from the ISO 15 general plan. With C 115 kN and C0 98.5 kN (C0/C ≈ 0.86) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Thermal planning around the 6,500 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 9,100 r/min for continuously high-duty 45 mm positions. Housing and shaft fillets must clear the ring chamfers of N309EA; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N309EA.", "Open N309EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "Do not replace N309EA with a deep-groove ball bearing on rating alone: line contact gives 115 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N309EA skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "The 115/98.5 kN ratings, 12 kN Pu and 865 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N309EA?", "a": "N309EA is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,500 r/min, oil 9,100 r/min, mass about 865 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N309EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N309EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 9,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n309ea", "＊n309ea", "N309EA" ], "locale_variants": {} }, { "sku": "NF2309EA", "brand": "NTN", "manufacturer_designation": "NTN NF2309EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 153, "fatigue_load_limit_kN": 18.7, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 8200, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF2309EA denotes a 45×100×36 mm (1.772 × 3.937 × 1.417 in) cylindrical roller bearing in the NF2300 family, the EA high-capacity pressed sheet-steel cage. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 45 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF2309EA. Rating life at 162 kN C assumes clean oil and adequate film; the 18.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF2309EA.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2309EA.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "Open NF2309EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 162/153 kN ratings, 18.7 kN Pu and 1300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2309EA?", "a": "NF2309EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 153 kN, Pu 18.7 kN, grease limiting speed 5,700 r/min, oil 8,200 r/min, mass about 1300 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2309EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2309EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2309ea", "＊nf2309ea", "NF2309EA" ], "locale_variants": {} }, { "sku": "NF309", "brand": "NTN", "manufacturer_designation": "NTN NF309", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 8400, "weight_g": 857, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF309 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 45×100×25 mm ISO 15 envelope. Numbering ties NF309 to its envelope: type code NF, series NF300, 45 mm bore; the 100×25 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 7,200 r/min grease and 8,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 45 mm bore. Equivalent-load planning treats NF309 as a pure radial bearing: keep P below 82 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF309.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NF309 with a deep-groove ball bearing on rating alone: line contact gives 82 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NF309 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 82/71 kN ratings, 8.65 kN Pu and 857 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF309?", "a": "NF309 is an NTN NF single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 7,200 r/min, oil 8,400 r/min, mass about 857 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF309 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF309 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 8,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf309", "＊＊nf309", "NF309" ], "locale_variants": {} }, { "sku": "NF309EA", "brand": "NTN", "manufacturer_designation": "NTN NF309EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 9100, "weight_g": 865, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF309EA on the 45×100 mm envelope, 25 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 6,500 r/min. Numbering ties NF309EA to its envelope: type code NF, series NF300, 45 mm bore; the 100×25 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NF309EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 45 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF309EA.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "Grease limiting speed 6,500 r/min and oil 9,100 r/min are different limits for NF309EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NF309EA with a deep-groove ball bearing on rating alone: line contact gives 115 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 115/98.5 kN ratings, 12 kN Pu and 865 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF309EA?", "a": "NF309EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,500 r/min, oil 9,100 r/min, mass about 865 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF309EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF309EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 9,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf309ea", "＊nf309ea", "NF309EA" ], "locale_variants": {} }, { "sku": "NJ2309", "brand": "NTN", "manufacturer_designation": "NTN NJ2309", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 110, "static_load_kN": 104, "fatigue_load_limit_kN": 12.7, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 1240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2309 is the extra-wide (23) section of the NTN NJ2300 dimension series for a 45 mm shaft — 110 kN of basic dynamic capacity in a 1240 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 100 mm OD and 36 mm width from the ISO 15 general plan. The 36 mm width and 27.5 mm section put the NJ2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 2.4 kN-per-mm-bore figure (110 kN over 45 mm) lets a NJ2309 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 45 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2309.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "If the shaft must be located both ways, do not use NJ2309 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NJ2309 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NJ2309 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 110/104 kN ratings, 12.7 kN Pu and 1240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2309?", "a": "NJ2309 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 104 kN, Pu 12.7 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 1240 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2309 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2309 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2309-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2309", "＊＊nj2309", "NJ2309" ], "locale_variants": {} }, { "sku": "NJ2309EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2309EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 153, "fatigue_load_limit_kN": 18.7, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 8200, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2309EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 45×100×36 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 100 mm OD and 36 mm width from the ISO 15 general plan. The 36 mm width and 27.5 mm section put the NJ2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NJ2309EA as a pure radial bearing: keep P below 162 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 45 mm shaft.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2309EA.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2309EA skids at 5,700 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2309EA skids at 5,700 r/min and fails by smearing long before L10 fatigue.", "The NJ rib arrangement is not interchangeable with another prefix on the same 45 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 100×36 mm envelope matches.", "Open NJ2309EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 162/153 kN ratings, 18.7 kN Pu and 1300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2309EA?", "a": "NJ2309EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 153 kN, Pu 18.7 kN, grease limiting speed 5,700 r/min, oil 8,200 r/min, mass about 1300 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2309EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2309EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2309ea", "＊nj2309ea", "NJ2309EA" ], "locale_variants": {} }, { "sku": "NJ309", "brand": "NTN", "manufacturer_designation": "NTN NJ309", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 8400, "weight_g": 857, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ309 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 82 kN dynamic rating in the 45 mm bore. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 100 mm OD and 25 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 7,200 r/min grease and 8,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 45 mm bore. The 45 mm (1.772 in) bore and 100 mm (3.937 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 25 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 45 mm shaft.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ309.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NJ309 with a deep-groove ball bearing on rating alone: line contact gives 82 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 82/71 kN pair here belongs to NJ309 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NJ309 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 82/71 kN ratings, 8.65 kN Pu and 857 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ309?", "a": "NJ309 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 7,200 r/min, oil 8,400 r/min, mass about 857 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ309 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ309 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 8,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ309-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj309", "＊＊nj309", "NJ309" ], "locale_variants": {} }, { "sku": "NJ309EA", "brand": "NTN", "manufacturer_designation": "NTN NJ309EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 9100, "weight_g": 865, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ309EA denotes a 45×100×25 mm (1.772 × 3.937 × 0.984 in) cylindrical roller bearing in the NJ300 family, the EA high-capacity pressed sheet-steel cage. Numbering ties NJ309EA to its envelope: type code NJ, series NJ300, 45 mm bore; the 100×25 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NJ309EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 865 g for the 45×100×25 mm NJ309EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ309EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ309EA.", "If the shaft must be located both ways, do not use NJ309EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NJ309EA with a deep-groove ball bearing on rating alone: line contact gives 115 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ309EA skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "Do not replace NJ309EA with a deep-groove ball bearing on rating alone: line contact gives 115 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 115/98.5 kN ratings, 12 kN Pu and 865 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ309EA?", "a": "NJ309EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,500 r/min, oil 9,100 r/min, mass about 865 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ309EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ309EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 9,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj309ea", "＊nj309ea", "NJ309EA" ], "locale_variants": {} }, { "sku": "NU2309-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2309", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 110, "static_load_kN": 104, "fatigue_load_limit_kN": 12.7, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 1240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2309 appears as a 45 mm bore single-row cylindrical roller bearing (110 kN C / 104 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 45 mm, with 100 mm OD and 36 mm width from the ISO 15 general plan. The 36 mm width and 27.5 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 12.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.95 (104/110 kN) shows the high-static-capacity proportioning of this 45 mm bore. Housing and shaft fillets must clear the ring chamfers of NU2309; an oversized radius locks the ring on its face and tilts the 36 mm-wide seat.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2309.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "If the shaft must be located both ways, do not use NU2309 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NU2309 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU2309 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 110/104 kN ratings, 12.7 kN Pu and 1240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2309?", "a": "NU2309 is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 104 kN, Pu 12.7 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 1240 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2309 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2309 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2309", "＊＊nu2309", "NU2309", "NU2309-NTN" ], "locale_variants": {} }, { "sku": "NU2309EA", "brand": "NTN", "manufacturer_designation": "NTN NU2309EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 153, "fatigue_load_limit_kN": 18.7, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 8200, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2309EA is the extra-wide (23) section of the NTN NU2300 dimension series for a 45 mm shaft — 162 kN of basic dynamic capacity in a 1300 g, open bearing. Digit by digit, NU2309EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU2309EA designation when purchasing. Thermal planning around the 5,700 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 8,200 r/min for continuously high-duty 45 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2309EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 162/153 kN pair here belongs to NU2309EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 162/153 kN ratings, 18.7 kN Pu and 1300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2309EA?", "a": "NU2309EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 153 kN, Pu 18.7 kN, grease limiting speed 5,700 r/min, oil 8,200 r/min, mass about 1300 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2309EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2309EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2309ea", "＊nu2309ea", "NU2309EA" ], "locale_variants": {} }, { "sku": "NU309-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU309", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 8400, "weight_g": 857, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies NU309: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 7,200 r/min on grease and 8,400 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU309 floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Rating life at 82 kN C assumes clean oil and adequate film; the 8.65 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NU309; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU309.", "If the shaft must be located both ways, do not use NU309 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 82/71 kN pair here belongs to NU309 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU309 skids at 7,200 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 82/71 kN pair here belongs to NU309 as printed, not to the bare size.", "The 82/71 kN ratings, 8.65 kN Pu and 857 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU309?", "a": "NU309 is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 7,200 r/min, oil 8,400 r/min, mass about 857 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU309 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU309 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 8,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu309", "＊＊nu309", "NU309", "NU309-NTN" ], "locale_variants": {} }, { "sku": "NU309EA", "brand": "NTN", "manufacturer_designation": "NTN NU309EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 9100, "weight_g": 865, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU309EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 115 kN dynamic rating in the 45 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU309EA floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 6,500 r/min grease and 9,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 45 mm bore. The 2.6 kN-per-mm-bore figure (115 kN over 45 mm) lets a NU309EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 45 mm shaft.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU309EA.", "Do not replace NU309EA with a deep-groove ball bearing on rating alone: line contact gives 115 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NU rib arrangement is not interchangeable with another prefix on the same 45 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×25 mm envelope matches.", "Open NU309EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "If the shaft must be located both ways, do not use NU309EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 115/98.5 kN ratings, 12 kN Pu and 865 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU309EA?", "a": "NU309EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,500 r/min, oil 9,100 r/min, mass about 865 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU309EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU309EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 9,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu309ea", "＊nu309ea", "NU309EA" ], "locale_variants": {} }, { "sku": "NUP2309", "brand": "NTN", "manufacturer_designation": "NTN NUP2309", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 110, "static_load_kN": 104, "fatigue_load_limit_kN": 12.7, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 1240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2309 appears as a 45 mm bore single-row cylindrical roller bearing (110 kN C / 104 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 45 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP2309 designation when purchasing. Thermal planning around the 6,300 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 7,400 r/min for continuously high-duty 45 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 45 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2309.", "The NUP rib arrangement is not interchangeable with another prefix on the same 45 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 100×36 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 110/104 kN pair here belongs to NUP2309 as printed, not to the bare size.", "Grease limiting speed 6,300 r/min and oil 7,400 r/min are different limits for NUP2309: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 110/104 kN ratings, 12.7 kN Pu and 1240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2309?", "a": "NUP2309 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 104 kN, Pu 12.7 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 1240 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2309 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2309 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2309-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2309", "＊＊nup2309", "NUP2309" ], "locale_variants": {} }, { "sku": "NUP2309EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2309EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 153, "fatigue_load_limit_kN": 18.7, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 8200, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies NUP2309EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,700 r/min on grease and 8,200 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2309EA floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. With C 162 kN and C0 153 kN (C0/C ≈ 0.94) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2309EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2309EA.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NUP rib arrangement is not interchangeable with another prefix on the same 45 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 100×36 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 162/153 kN pair here belongs to NUP2309EA as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2309EA skids at 5,700 r/min and fails by smearing long before L10 fatigue.", "The 162/153 kN ratings, 18.7 kN Pu and 1300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2309EA?", "a": "NUP2309EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 153 kN, Pu 18.7 kN, grease limiting speed 5,700 r/min, oil 8,200 r/min, mass about 1300 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2309EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2309EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2309ea", "＊nup2309ea", "NUP2309EA" ], "locale_variants": {} }, { "sku": "NUP309", "brand": "NTN", "manufacturer_designation": "NTN NUP309", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82, "static_load_kN": 71, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 7200, "max_rpm": 7200, "speed_oil_rpm": 8400, "weight_g": 857, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP309 on the 45×100 mm envelope, 25 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 7,200 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP309 floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP309 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 7,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 8,400 r/min for continuously high-duty 45 mm positions. Heat the inner ring to max 120 °C for the 45 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP309.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Open NUP309 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "Do not replace NUP309 with a deep-groove ball bearing on rating alone: line contact gives 82 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 82/71 kN ratings, 8.65 kN Pu and 857 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP309 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP309?", "a": "NUP309 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82 kN, C0 71 kN, Pu 8.65 kN, grease limiting speed 7,200 r/min, oil 8,400 r/min, mass about 857 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP309 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP309 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP309 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP309?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 86.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,200 r/min grease / 8,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP309-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup309", "＊＊nup309", "NUP309" ], "locale_variants": {} }, { "sku": "NUP309EA", "brand": "NTN", "manufacturer_designation": "NTN NUP309EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 9100, "weight_g": 865, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies NUP309EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 6,500 r/min on grease and 9,100 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 45 mm (00–03 use the 10/12/15/17 exception table). At 9,100 r/min with oil versus 6,500 r/min with grease (a 2,600 r/min band), lubrication choice for NUP309EA is a thermal decision, not just a sealing one. Equivalent-load planning treats NUP309EA as a pure radial bearing: keep P below 115 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 45 mm shaft.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP309EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Open NUP309EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "The 27.5 mm section at 45 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 25 mm-wide cavity.", "Grease limiting speed 6,500 r/min and oil 9,100 r/min are different limits for NUP309EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 115/98.5 kN ratings, 12 kN Pu and 865 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP309EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP309EA?", "a": "NUP309EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,500 r/min, oil 9,100 r/min, mass about 865 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP309EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP309EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP309EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 58.5 mm, Ew 88.5 mm. The nominal bore/OD remain 45/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 9,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP309EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup309ea", "＊nup309ea", "NUP309EA" ], "locale_variants": {} }, { "sku": "N409", "brand": "NTN", "manufacturer_designation": "NTN N409", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 119, "static_load_kN": 102, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N409 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 119 kN dynamic rating in the 45 mm bore. Numbering ties N409 to its envelope: type code N, series N400, 45 mm bore; the 120×29 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N409. Rating life at 119 kN C assumes clean oil and adequate film; the 12.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 45 mm shaft.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N409.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "The N rib arrangement is not interchangeable with another prefix on the same 45 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 120×29 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The 119/102 kN ratings, 12.4 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N409 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N409?", "a": "N409 is an NTN N single-row cylindrical roller bearing to ISO 15: 45 mm bore, 120 mm OD and 29 mm width (1.772 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1580 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N409 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N409 is supplied in the standard open execution shown in the table." }, { "q": "Can N409 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N409?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 100.5 mm. The nominal bore/OD remain 45/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N409", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n409", "N409" ], "locale_variants": {} }, { "sku": "NF409", "brand": "NTN", "manufacturer_designation": "NTN NF409", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 119, "static_load_kN": 102, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF409 on the 45×120 mm envelope, 29 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,100 r/min. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF409 floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. With C 119 kN and C0 102 kN (C0/C ≈ 0.86) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Selection arithmetic: Pu 12.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.86 (102/119 kN) shows the high-static-capacity proportioning of this 45 mm bore. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF409.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 119/102 kN pair here belongs to NF409 as printed, not to the bare size.", "The NF rib arrangement is not interchangeable with another prefix on the same 45 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 120×29 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 119/102 kN pair here belongs to NF409 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF409 skids at 5,100 r/min and fails by smearing long before L10 fatigue.", "The 119/102 kN ratings, 12.4 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF409 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF409?", "a": "NF409 is an NTN NF single-row cylindrical roller bearing to ISO 15: 45 mm bore, 120 mm OD and 29 mm width (1.772 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1580 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF409 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF409 is supplied in the standard open execution shown in the table." }, { "q": "Can NF409 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF409?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 100.5 mm. The nominal bore/OD remain 45/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF409", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf409", "NF409" ], "locale_variants": {} }, { "sku": "NJ409-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ409", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 119, "static_load_kN": 102, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies NJ409: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 5,100 r/min on grease and 6,000 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ409 floats or locates; the numeric remainder is the ISO 15 series and 45 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ409 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 119 kN C assumes clean oil and adequate film; the 12.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NJ409; an oversized radius locks the ring on its face and tilts the 29 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ409.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ400 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NJ409 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 45 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NJ400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 119/102 kN ratings, 12.4 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ409 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ409?", "a": "NJ409 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 45 mm bore, 120 mm OD and 29 mm width (1.772 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1580 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ409 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ409 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ409 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ409?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 100.5 mm. The nominal bore/OD remain 45/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj409", "NJ409", "NJ409-NTN" ], "locale_variants": {} }, { "sku": "NU409-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU409", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 119, "static_load_kN": 102, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU409 is the heavy (04) section of the NTN NU400 dimension series for a 45 mm shaft — 119 kN of basic dynamic capacity in a 1580 g, open bearing. Numbering ties NU409 to its envelope: type code NU, series NU400, 45 mm bore; the 120×29 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU409 designation when purchasing. The 2.6 kN-per-mm-bore figure (119 kN over 45 mm) lets a NU409 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 45 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU409.", "If the shaft must be located both ways, do not use NU409 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NU rib arrangement is not interchangeable with another prefix on the same 45 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 120×29 mm envelope matches.", "If the shaft must be located both ways, do not use NU409 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 119/102 kN ratings, 12.4 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU409 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU409?", "a": "NU409 is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 120 mm OD and 29 mm width (1.772 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1580 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU409 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU409 is supplied in the standard open execution shown in the table." }, { "q": "Can NU409 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU409?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 100.5 mm. The nominal bore/OD remain 45/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu409", "NU409", "NU409-NTN" ], "locale_variants": {} }, { "sku": "NUP409", "brand": "NTN", "manufacturer_designation": "NTN NUP409", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 119, "static_load_kN": 102, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 45 mm shaft NTN supplies NUP409: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,100 r/min on grease and 6,000 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 45 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP409 designation when purchasing. Selection arithmetic: Pu 12.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.86 (102/119 kN) shows the high-static-capacity proportioning of this 45 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP409.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP409.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP409 skids at 5,100 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NUP400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.", "The 119/102 kN ratings, 12.4 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP409 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP409?", "a": "NUP409 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 120 mm OD and 29 mm width (1.772 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1580 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP409 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP409 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP409 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP409?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 100.5 mm. The nominal bore/OD remain 45/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP409", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup409", "NUP409" ], "locale_variants": {} }, { "sku": "N1010", "brand": "NTN", "manufacturer_designation": "NTN N1010", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35.5, "static_load_kN": 36, "fatigue_load_limit_kN": 4.4, "limiting_speed_rpm": 8900, "max_rpm": 8900, "speed_oil_rpm": 11000, "weight_g": 291, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N1010 on the 50×80 mm envelope, 16 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 8,900 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 80 mm OD and 16 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 8,900 r/min is .81 of the 11,000 r/min oil value for N1010; grease-churn heating closes that gap as fill quantity rises. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N1010.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 15.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 35.5/36 kN pair here belongs to N1010 as printed, not to the bare size.", "The 35.5/36 kN ratings, 4.4 kN Pu and 291 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1010 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1010?", "a": "N1010 is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 80 mm OD and 16 mm width (1.969 × 3.15 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 35.5 kN, C0 36 kN, Pu 4.4 kN, grease limiting speed 8,900 r/min, oil 11,000 r/min, mass about 291 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1010 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1010 is supplied in the standard open execution shown in the table." }, { "q": "Can N1010 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1010?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 57.5 mm, Ew 72.5 mm. The nominal bore/OD remain 50/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,900 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1010", "N1010" ], "locale_variants": {} }, { "sku": "NJ1010", "brand": "NTN", "manufacturer_designation": "NTN NJ1010", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35.5, "static_load_kN": 36, "fatigue_load_limit_kN": 4.4, "limiting_speed_rpm": 8900, "max_rpm": 8900, "speed_oil_rpm": 11000, "weight_g": 291, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1010 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 50×80×16 mm ISO 15 envelope. Numbering ties NJ1010 to its envelope: type code NJ, series NJ1000, 50 mm bore; the 80×16 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 16 mm width and 15.0 mm section put the NJ1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 8,900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 11,000 r/min for continuously high-duty 50 mm positions. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 50 mm shaft.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ1010.", "If the shaft must be located both ways, do not use NJ1010 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NJ1010 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1010 skids at 8,900 r/min and fails by smearing long before L10 fatigue.", "Open NJ1010 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 35.5/36 kN ratings, 4.4 kN Pu and 291 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1010 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1010?", "a": "NJ1010 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 80 mm OD and 16 mm width (1.969 × 3.15 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 35.5 kN, C0 36 kN, Pu 4.4 kN, grease limiting speed 8,900 r/min, oil 11,000 r/min, mass about 291 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1010 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1010 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1010 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1010?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 57.5 mm, Ew 72.5 mm. The nominal bore/OD remain 50/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,900 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1010", "NJ1010" ], "locale_variants": {} }, { "sku": "NN3010", "brand": "NTN", "manufacturer_designation": "NTN NN3010", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 59, "static_load_kN": 72.5, "fatigue_load_limit_kN": 8.85, "limiting_speed_rpm": 8000, "max_rpm": 8000, "speed_oil_rpm": 9400, "weight_g": 433, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3010 is the standard section of the NTN NN3000 dimension series for a 50 mm shaft — 59 kN of basic dynamic capacity in a 433 g, open bearing. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 1.2 kN-per-mm-bore figure (59 kN over 50 mm) lets a NN3010 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3010.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3010.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "Grease limiting speed 8,000 r/min and oil 9,400 r/min are different limits for NN3010: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 59/72.5 kN pair here belongs to NN3010 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 59/72.5 kN pair here belongs to NN3010 as printed, not to the bare size.", "The 59/72.5 kN ratings, 8.85 kN Pu and 433 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3010 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3010?", "a": "NN3010 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 50 mm bore, 80 mm OD and 23 mm width (1.969 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 59 kN, C0 72.5 kN, Pu 8.85 kN, grease limiting speed 8,000 r/min, oil 9,400 r/min, mass about 433 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3010 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3010 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3010?", "a": "NN3010 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN3010?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 72.555 mm. The nominal bore/OD remain 50/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,000 r/min grease / 9,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3010", "NN3010" ], "locale_variants": {} }, { "sku": "NN3010K", "brand": "NTN", "manufacturer_designation": "NTN NN3010K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 59, "static_load_kN": 72.5, "fatigue_load_limit_kN": 8.85, "limiting_speed_rpm": 8000, "max_rpm": 8000, "speed_oil_rpm": 9400, "weight_g": 419, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NN3010K on the 50×80 mm envelope, 23 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 8,000 r/min. Numbering ties NN3010K to its envelope: type code NN, series NN3000, 50 mm bore; the 80×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3010K. Equivalent-load planning treats NN3010K as a pure radial bearing: keep P below 59 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3010K.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 59/72.5 kN pair here belongs to NN3010K as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 80 mm race brinells and releases as vibration within hours.", "The 59/72.5 kN ratings, 8.85 kN Pu and 419 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3010K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3010K?", "a": "NN3010K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 50 mm bore, 80 mm OD and 23 mm width (1.969 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 59 kN, C0 72.5 kN, Pu 8.85 kN, grease limiting speed 8,000 r/min, oil 9,400 r/min, mass about 419 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3010K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3010K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3010K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3010K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3010 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN3010K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Ew 72.555 mm. The nominal bore/OD remain 50/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,000 r/min grease / 9,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN3010K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3010k", "NN3010K" ], "locale_variants": {} }, { "sku": "NU1010", "brand": "NTN", "manufacturer_designation": "NTN NU1010", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35.5, "static_load_kN": 36, "fatigue_load_limit_kN": 4.4, "limiting_speed_rpm": 8900, "max_rpm": 8900, "speed_oil_rpm": 11000, "weight_g": 291, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1010 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 50 mm shaft — 35.5 kN of basic dynamic capacity in a 291 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). The 15.0 mm radial section ((80−50)/2) frames the roller complement; capacity per millimetre of bore is about 0.7 kN/mm before application factors. Mass 291 g for the 50×80×16 mm NU1010 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1010.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU1010.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1010 skids at 8,900 r/min and fails by smearing long before L10 fatigue.", "The 15.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1010 skids at 8,900 r/min and fails by smearing long before L10 fatigue.", "The 15.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 16 mm-wide cavity.", "The 35.5/36 kN ratings, 4.4 kN Pu and 291 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1010 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1010?", "a": "NU1010 is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 80 mm OD and 16 mm width (1.969 × 3.15 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 35.5 kN, C0 36 kN, Pu 4.4 kN, grease limiting speed 8,900 r/min, oil 11,000 r/min, mass about 291 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1010 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1010 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1010 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1010?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 57.5 mm, Ew 72.5 mm. The nominal bore/OD remain 50/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,900 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1010-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1010", "NU1010" ], "locale_variants": {} }, { "sku": "NUP1010", "brand": "NTN", "manufacturer_designation": "NTN NUP1010", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35.5, "static_load_kN": 36, "fatigue_load_limit_kN": 4.4, "limiting_speed_rpm": 8900, "max_rpm": 8900, "speed_oil_rpm": 11000, "weight_g": 291, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1010 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 50 mm shaft — 35.5 kN of basic dynamic capacity in a 291 g, open bearing. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Rating life at 35.5 kN C assumes clean oil and adequate film; the 4.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NUP1010; an oversized radius locks the ring on its face and tilts the 16 mm-wide seat.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP1010.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1010 skids at 8,900 r/min and fails by smearing long before L10 fatigue.", "Open NUP1010 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Open NUP1010 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 35.5/36 kN pair here belongs to NUP1010 as printed, not to the bare size.", "The 35.5/36 kN ratings, 4.4 kN Pu and 291 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1010 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1010?", "a": "NUP1010 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 80 mm OD and 16 mm width (1.969 × 3.15 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 35.5 kN, C0 36 kN, Pu 4.4 kN, grease limiting speed 8,900 r/min, oil 11,000 r/min, mass about 291 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1010 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1010 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1010 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1010?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 57.5 mm, Ew 72.5 mm. The nominal bore/OD remain 50/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,900 r/min grease / 11,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1010", "NUP1010" ], "locale_variants": {} }, { "sku": "N210", "brand": "NTN", "manufacturer_designation": "NTN N210", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N210 is the standard section of the NTN N200 dimension series for a 50 mm shaft — 53.5 kN of basic dynamic capacity in a 460 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 90 mm OD and 20 mm width from the ISO 15 general plan. At 9,000 r/min with oil versus 7,600 r/min with grease (a 1,400 r/min band), lubrication choice for N210 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 50 mm shaft.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N210.", "Open N210 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "If the shaft must be located both ways, do not use N210 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 7,600 r/min and oil 9,000 r/min are different limits for N210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 53.5/51 kN ratings, 6.2 kN Pu and 460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N210?", "a": "N210 is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 53.5 kN, C0 51 kN, Pu 6.2 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N210 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N210 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N210-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n210", "＊＊n210", "N210" ], "locale_variants": {} }, { "sku": "N210EA", "brand": "NTN", "manufacturer_designation": "NTN N210EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81.5, "static_load_kN": 76.5, "fatigue_load_limit_kN": 9.3, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 9700, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N210EA is the standard section of the NTN N200 dimension series for a 50 mm shaft — 81.5 kN of basic dynamic capacity in a 470 g, open bearing. Digit by digit, N210EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 9,700 r/min with oil versus 6,900 r/min with grease (a 2,800 r/min band), lubrication choice for N210EA is a thermal decision, not just a sealing one. Speed ratio check: limiting 6,900 r/min is .71 of the 9,700 r/min oil value for N210EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N210EA.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N210EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 81.5/76.5 kN pair here belongs to N210EA as printed, not to the bare size.", "Open N210EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "Grease limiting speed 6,900 r/min and oil 9,700 r/min are different limits for N210EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 81.5/76.5 kN ratings, 9.3 kN Pu and 470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N210EA?", "a": "N210EA is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 81.5 kN, C0 76.5 kN, Pu 9.3 kN, grease limiting speed 6,900 r/min, oil 9,700 r/min, mass about 470 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N210EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N210EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n210ea", "＊n210ea", "N210EA" ], "locale_variants": {} }, { "sku": "N2210", "brand": "NTN", "manufacturer_designation": "NTN N2210", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 71, "static_load_kN": 73.5, "fatigue_load_limit_kN": 9, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8100, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 50 mm shaft NTN supplies N2210: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 6,900 r/min on grease and 8,100 r/min on oil. Digit by digit, N2210 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 6,900 r/min grease and 8,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 50 mm bore. Speed ratio check: limiting 6,900 r/min is .85 of the 8,100 r/min oil value for N2210; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 50 mm shaft.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2210.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "The N rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "Open N2210 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "If the shaft must be located both ways, do not use N2210 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 71/73.5 kN ratings, 9 kN Pu and 560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2210?", "a": "N2210 is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 71 kN, C0 73.5 kN, Pu 9 kN, grease limiting speed 6,900 r/min, oil 8,100 r/min, mass about 560 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2210 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2210 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2210", "＊＊n2210", "N2210" ], "locale_variants": {} }, { "sku": "N2210EA", "brand": "NTN", "manufacturer_designation": "NTN N2210EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 97, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 6200, "max_rpm": 6200, "speed_oil_rpm": 8800, "weight_g": 584, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2210EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 50×90×23 mm ISO 15 envelope. On the NTN nameplate N states which ring carries the ribs, which determines whether N2210EA floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 59.5 mm and Ew 81.5 mm — the envelope inside the 50/90 mm bore/OD where the rollers actually run. Mass 584 g for the 50×90×23 mm N2210EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 50 mm shaft.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2210EA.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 6,200 r/min and oil 8,800 r/min are different limits for N2210EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The N rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "The 98.5/97 kN ratings, 11.9 kN Pu and 584 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2210EA?", "a": "N2210EA is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 97 kN, Pu 11.9 kN, grease limiting speed 6,200 r/min, oil 8,800 r/min, mass about 584 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2210EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2210EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,200 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2210ea", "＊n2210ea", "N2210EA" ], "locale_variants": {} }, { "sku": "NF210", "brand": "NTN", "manufacturer_designation": "NTN NF210", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF210 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 53.5 kN dynamic rating in the 50 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). The 20.0 mm radial section ((90−50)/2) frames the roller complement; capacity per millimetre of bore is about 1.1 kN/mm before application factors. Equivalent-load planning treats NF210 as a pure radial bearing: keep P below 53.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF210.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "The NF rib arrangement is not interchangeable with another prefix on the same 50 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 90×20 mm envelope matches.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "The 53.5/51 kN ratings, 6.2 kN Pu and 460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF210?", "a": "NF210 is an NTN NF single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 53.5 kN, C0 51 kN, Pu 6.2 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF210 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF210 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf210", "＊＊nf210", "NF210" ], "locale_variants": {} }, { "sku": "NF210EA", "brand": "NTN", "manufacturer_designation": "NTN NF210EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81.5, "static_load_kN": 76.5, "fatigue_load_limit_kN": 9.3, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 9700, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF210EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 50×90×20 mm ISO 15 envelope. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF210EA floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 59.5 mm and Ew 81.5 mm — the envelope inside the 50/90 mm bore/OD where the rollers actually run. The 50 mm (1.969 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 20 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 50 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF210EA.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "The NF rib arrangement is not interchangeable with another prefix on the same 50 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 90×20 mm envelope matches.", "The 81.5/76.5 kN ratings, 9.3 kN Pu and 470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF210EA?", "a": "NF210EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 81.5 kN, C0 76.5 kN, Pu 9.3 kN, grease limiting speed 6,900 r/min, oil 9,700 r/min, mass about 470 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF210EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF210EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf210ea", "＊nf210ea", "NF210EA" ], "locale_variants": {} }, { "sku": "NF2210EA", "brand": "NTN", "manufacturer_designation": "NTN NF2210EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 97, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 6200, "max_rpm": 6200, "speed_oil_rpm": 8800, "weight_g": 584, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2210EA is the wide (22) section of the NTN NF2200 dimension series for a 50 mm shaft — 98.5 kN of basic dynamic capacity in a 584 g, open bearing. Numbering ties NF2210EA to its envelope: type code NF, series NF2200, 50 mm bore; the 90×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 11.9 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.98 (97/98.5 kN) shows the high-static-capacity proportioning of this 50 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 50 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2210EA.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "If the shaft must be located both ways, do not use NF2210EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 6,200 r/min and oil 8,800 r/min are different limits for NF2210EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98.5/97 kN pair here belongs to NF2210EA as printed, not to the bare size.", "The 98.5/97 kN ratings, 11.9 kN Pu and 584 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2210EA?", "a": "NF2210EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 97 kN, Pu 11.9 kN, grease limiting speed 6,200 r/min, oil 8,800 r/min, mass about 584 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2210EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2210EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,200 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2210ea", "＊nf2210ea", "NF2210EA" ], "locale_variants": {} }, { "sku": "NJ210", "brand": "NTN", "manufacturer_designation": "NTN NJ210", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ210 denotes a 50×90×20 mm (1.969 × 3.543 × 0.787 in) cylindrical roller bearing in the NJ200 family, a pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). At 9,000 r/min with oil versus 7,600 r/min with grease (a 1,400 r/min band), lubrication choice for NJ210 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ210.", "If the shaft must be located both ways, do not use NJ210 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ210 skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 53.5/51 kN pair here belongs to NJ210 as printed, not to the bare size.", "Grease limiting speed 7,600 r/min and oil 9,000 r/min are different limits for NJ210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 53.5/51 kN ratings, 6.2 kN Pu and 460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ210?", "a": "NJ210 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 53.5 kN, C0 51 kN, Pu 6.2 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ210 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ210 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ210-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj210", "＊＊nj210", "NJ210" ], "locale_variants": {} }, { "sku": "NJ210EA", "brand": "NTN", "manufacturer_designation": "NTN NJ210EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81.5, "static_load_kN": 76.5, "fatigue_load_limit_kN": 9.3, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 9700, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ210EA denotes a 50×90×20 mm (1.969 × 3.543 × 0.787 in) cylindrical roller bearing in the NJ200 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ210EA floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. The 20 mm width and 20.0 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ210EA.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 81.5/76.5 kN pair here belongs to NJ210EA as printed, not to the bare size.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NJ210EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 81.5/76.5 kN ratings, 9.3 kN Pu and 470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ210EA?", "a": "NJ210EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 81.5 kN, C0 76.5 kN, Pu 9.3 kN, grease limiting speed 6,900 r/min, oil 9,700 r/min, mass about 470 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ210EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ210EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj210ea", "＊nj210ea", "NJ210EA" ], "locale_variants": {} }, { "sku": "NJ2210", "brand": "NTN", "manufacturer_designation": "NTN NJ2210", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 71, "static_load_kN": 73.5, "fatigue_load_limit_kN": 9, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8100, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2210 on the 50×90 mm envelope, 23 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 6,900 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). At 8,100 r/min with oil versus 6,900 r/min with grease (a 1,200 r/min band), lubrication choice for NJ2210 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 9 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.04 (73.5/71 kN) shows the high-static-capacity proportioning of this 50 mm bore. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2210.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2210 skids at 6,900 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 6,900 r/min and oil 8,100 r/min are different limits for NJ2210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2210 skids at 6,900 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 6,900 r/min and oil 8,100 r/min are different limits for NJ2210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 71/73.5 kN ratings, 9 kN Pu and 560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2210?", "a": "NJ2210 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 71 kN, C0 73.5 kN, Pu 9 kN, grease limiting speed 6,900 r/min, oil 8,100 r/min, mass about 560 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2210 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2210 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2210-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2210", "＊＊nj2210", "NJ2210" ], "locale_variants": {} }, { "sku": "NJ2210EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2210EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 97, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 6200, "max_rpm": 6200, "speed_oil_rpm": 8800, "weight_g": 584, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2210EA denotes a 50×90×23 mm (1.969 × 3.543 × 0.906 in) cylindrical roller bearing in the NJ2200 family, the EA high-capacity pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2210EA. Rating life at 98.5 kN C assumes clean oil and adequate film; the 11.9 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2210EA.", "Do not replace NJ2210EA with a deep-groove ball bearing on rating alone: line contact gives 98.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98.5/97 kN pair here belongs to NJ2210EA as printed, not to the bare size.", "The 20.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "The 98.5/97 kN ratings, 11.9 kN Pu and 584 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2210EA?", "a": "NJ2210EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 97 kN, Pu 11.9 kN, grease limiting speed 6,200 r/min, oil 8,800 r/min, mass about 584 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2210EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2210EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,200 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2210ea", "＊nj2210ea", "NJ2210EA" ], "locale_variants": {} }, { "sku": "NU210-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU210", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU210 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 50×90×20 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU210 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 7,600 r/min is .84 of the 9,000 r/min oil value for NU210; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU210 non-locating position preloads the bearing when the shaft grows.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU210.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU210 skids at 7,600 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 7,600 r/min and oil 9,000 r/min are different limits for NU210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NU210 with a deep-groove ball bearing on rating alone: line contact gives 53.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 53.5/51 kN ratings, 6.2 kN Pu and 460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU210?", "a": "NU210 is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 53.5 kN, C0 51 kN, Pu 6.2 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU210 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU210 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu210", "＊＊nu210", "NU210", "NU210-NTN" ], "locale_variants": {} }, { "sku": "NU210EA", "brand": "NTN", "manufacturer_designation": "NTN NU210EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81.5, "static_load_kN": 76.5, "fatigue_load_limit_kN": 9.3, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 9700, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 50 mm shaft NTN supplies NU210EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 6,900 r/min on grease and 9,700 r/min on oil. Digit by digit, NU210EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 81.5 kN and C0 76.5 kN (C0/C ≈ 0.94) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 6,900 r/min is .71 of the 9,700 r/min oil value for NU210EA; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU210EA.", "Grease limiting speed 6,900 r/min and oil 9,700 r/min are different limits for NU210EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 6,900 r/min and oil 9,700 r/min are different limits for NU210EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU210EA skids at 6,900 r/min and fails by smearing long before L10 fatigue.", "The 81.5/76.5 kN ratings, 9.3 kN Pu and 470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU210EA?", "a": "NU210EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 81.5 kN, C0 76.5 kN, Pu 9.3 kN, grease limiting speed 6,900 r/min, oil 9,700 r/min, mass about 470 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU210EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU210EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu210ea", "＊nu210ea", "NU210EA" ], "locale_variants": {} }, { "sku": "NU2210-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2210", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 71, "static_load_kN": 73.5, "fatigue_load_limit_kN": 9, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8100, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2210 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 71 kN dynamic rating in the 50 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 90 mm OD and 23 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NU2210 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 6,900 r/min is .85 of the 8,100 r/min oil value for NU2210; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 50 mm shaft.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2210.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2210 skids at 6,900 r/min and fails by smearing long before L10 fatigue.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 71/73.5 kN ratings, 9 kN Pu and 560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2210?", "a": "NU2210 is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 71 kN, C0 73.5 kN, Pu 9 kN, grease limiting speed 6,900 r/min, oil 8,100 r/min, mass about 560 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2210 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2210 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2210", "＊＊nu2210", "NU2210", "NU2210-NTN" ], "locale_variants": {} }, { "sku": "NU2210EA", "brand": "NTN", "manufacturer_designation": "NTN NU2210EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 97, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 6200, "max_rpm": 6200, "speed_oil_rpm": 8800, "weight_g": 584, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2210EA appears as a 50 mm bore single-row cylindrical roller bearing (98.5 kN C / 97 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 90 mm OD and 23 mm width from the ISO 15 general plan. At 8,800 r/min with oil versus 6,200 r/min with grease (a 2,600 r/min band), lubrication choice for NU2210EA is a thermal decision, not just a sealing one. Mass 584 g for the 50×90×23 mm NU2210EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NU2210EA; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2210EA.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2210EA skids at 6,200 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98.5/97 kN pair here belongs to NU2210EA as printed, not to the bare size.", "Grease limiting speed 6,200 r/min and oil 8,800 r/min are different limits for NU2210EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 98.5/97 kN ratings, 11.9 kN Pu and 584 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2210EA?", "a": "NU2210EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 97 kN, Pu 11.9 kN, grease limiting speed 6,200 r/min, oil 8,800 r/min, mass about 584 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2210EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2210EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,200 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2210ea", "＊nu2210ea", "NU2210EA" ], "locale_variants": {} }, { "sku": "NUP210", "brand": "NTN", "manufacturer_designation": "NTN NUP210", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 7600, "max_rpm": 7600, "speed_oil_rpm": 9000, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP210 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 53.5 kN dynamic rating in the 50 mm bore. Digit by digit, NUP210 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 20 mm width and 20.0 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NUP210 as a pure radial bearing: keep P below 53.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP210; an oversized radius locks the ring on its face and tilts the 20 mm-wide seat.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP210.", "Grease limiting speed 7,600 r/min and oil 9,000 r/min are different limits for NUP210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 20 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Open NUP210 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Open NUP210 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 53.5/51 kN ratings, 6.2 kN Pu and 460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP210?", "a": "NUP210 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 53.5 kN, C0 51 kN, Pu 6.2 kN, grease limiting speed 7,600 r/min, oil 9,000 r/min, mass about 460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP210 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP210 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,600 r/min grease / 9,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP210-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup210", "＊＊nup210", "NUP210" ], "locale_variants": {} }, { "sku": "NUP210EA", "brand": "NTN", "manufacturer_designation": "NTN NUP210EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81.5, "static_load_kN": 76.5, "fatigue_load_limit_kN": 9.3, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 9700, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP210EA on the 50×90 mm envelope, 20 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 6,900 r/min. Numbering ties NUP210EA to its envelope: type code NUP, series NUP200, 50 mm bore; the 90×20 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 20 mm width and 20.0 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 81.5 kN C assumes clean oil and adequate film; the 9.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP210EA.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NUP210EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NUP210EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NUP210EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 81.5/76.5 kN ratings, 9.3 kN Pu and 470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP210EA?", "a": "NUP210EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 20 mm width (1.969 × 3.543 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 81.5 kN, C0 76.5 kN, Pu 9.3 kN, grease limiting speed 6,900 r/min, oil 9,700 r/min, mass about 470 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP210EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP210EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup210ea", "＊nup210ea", "NUP210EA" ], "locale_variants": {} }, { "sku": "NUP2210", "brand": "NTN", "manufacturer_designation": "NTN NUP2210", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 71, "static_load_kN": 73.5, "fatigue_load_limit_kN": 9, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8100, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2210 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 50×90×23 mm ISO 15 envelope. Numbering ties NUP2210 to its envelope: type code NUP, series NUP2200, 50 mm bore; the 90×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NUP2210 as a pure radial bearing: keep P below 71 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2210 non-locating position preloads the bearing when the shaft grows.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2210.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 71/73.5 kN pair here belongs to NUP2210 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NUP2210 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 6,900 r/min and oil 8,100 r/min are different limits for NUP2210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 71/73.5 kN pair here belongs to NUP2210 as printed, not to the bare size.", "The 71/73.5 kN ratings, 9 kN Pu and 560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2210 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2210?", "a": "NUP2210 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 71 kN, C0 73.5 kN, Pu 9 kN, grease limiting speed 6,900 r/min, oil 8,100 r/min, mass about 560 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2210 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2210 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2210 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2210?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2210-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2210", "＊＊nup2210", "NUP2210" ], "locale_variants": {} }, { "sku": "NUP2210EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2210EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 97, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 6200, "max_rpm": 6200, "speed_oil_rpm": 8800, "weight_g": 584, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2210EA on the 50×90 mm envelope, 23 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 6,200 r/min. Digit by digit, NUP2210EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP2210EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 50 mm (1.969 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2210EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2210EA.", "The NUP rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "Grease limiting speed 6,200 r/min and oil 8,800 r/min are different limits for NUP2210EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NUP rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 90×23 mm envelope matches.", "Do not replace NUP2210EA with a deep-groove ball bearing on rating alone: line contact gives 98.5 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 98.5/97 kN ratings, 11.9 kN Pu and 584 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2210EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2210EA?", "a": "NUP2210EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98.5 kN, C0 97 kN, Pu 11.9 kN, grease limiting speed 6,200 r/min, oil 8,800 r/min, mass about 584 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2210EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2210EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2210EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 59.5 mm, Ew 81.5 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,200 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2210EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2210ea", "＊nup2210ea", "NUP2210EA" ], "locale_variants": {} }, { "sku": "N2310", "brand": "NTN", "manufacturer_designation": "NTN N2310", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 131, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2310 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 134 kN dynamic rating in the 50 mm bore. Numbering ties N2310 to its envelope: type code N, series N2300, 50 mm bore; the 110×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 134 kN and C0 131 kN (C0/C ≈ 0.98) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 50 mm (1.969 in) bore and 110 mm (4.331 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 40 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 50 mm shaft.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2310.", "The N rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×40 mm envelope matches.", "Open N2310 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Grease limiting speed 5,700 r/min and oil 6,700 r/min are different limits for N2310: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2310 skids at 5,700 r/min and fails by smearing long before L10 fatigue.", "The 134/131 kN ratings, 16 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2310?", "a": "N2310 is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 131 kN, Pu 16 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2310 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2310 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2310", "＊＊n2310", "N2310" ], "locale_variants": {} }, { "sku": "N2310EA", "brand": "NTN", "manufacturer_designation": "NTN N2310EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 187, "fatigue_load_limit_kN": 22.7, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2310EA appears as a 50 mm bore single-row cylindrical roller bearing (192 kN C / 187 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives N2310EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 22.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.97 (187/192 kN) shows the high-static-capacity proportioning of this 50 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 50 mm shaft.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2310EA.", "The N rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×40 mm envelope matches.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 192/187 kN pair here belongs to N2310EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 192/187 kN ratings, 22.7 kN Pu and 1750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2310EA?", "a": "N2310EA is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 192 kN, C0 187 kN, Pu 22.7 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2310EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2310EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2310ea", "＊n2310ea", "N2310EA" ], "locale_variants": {} }, { "sku": "N310", "brand": "NTN", "manufacturer_designation": "NTN N310", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 96.5, "static_load_kN": 86, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7700, "weight_g": 1110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N310 denotes a 50×110×27 mm (1.969 × 4.331 × 1.063 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N310 floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. The 30.0 mm radial section ((110−50)/2) frames the roller complement; capacity per millimetre of bore is about 1.9 kN/mm before application factors. Speed ratio check: limiting 6,500 r/min is .84 of the 7,700 r/min oil value for N310; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N310.", "If the shaft must be located both ways, do not use N310 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "The N rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×27 mm envelope matches.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "The 96.5/86 kN ratings, 10.5 kN Pu and 1110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N310?", "a": "N310 is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 96.5 kN, C0 86 kN, Pu 10.5 kN, grease limiting speed 6,500 r/min, oil 7,700 r/min, mass about 1110 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N310 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N310 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N310-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n310", "＊＊n310", "N310" ], "locale_variants": {} }, { "sku": "N310EA", "brand": "NTN", "manufacturer_designation": "NTN N310EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 130, "static_load_kN": 113, "fatigue_load_limit_kN": 13.8, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 8300, "weight_g": 1120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N310EA on the 50×110 mm envelope, 27 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,900 r/min. Numbering ties N310EA to its envelope: type code N, series N300, 50 mm bore; the 110×27 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 130 kN and C0 113 kN (C0/C ≈ 0.87) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Housing and shaft fillets must clear the ring chamfers of N310EA; an oversized radius locks the ring on its face and tilts the 27 mm-wide seat.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N310EA.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N310EA skids at 5,900 r/min and fails by smearing long before L10 fatigue.", "The 130/113 kN ratings, 13.8 kN Pu and 1120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N310EA?", "a": "N310EA is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 113 kN, Pu 13.8 kN, grease limiting speed 5,900 r/min, oil 8,300 r/min, mass about 1120 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N310EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N310EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 8,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n310ea", "＊n310ea", "N310EA" ], "locale_variants": {} }, { "sku": "NF2310EA", "brand": "NTN", "manufacturer_designation": "NTN NF2310EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 187, "fatigue_load_limit_kN": 22.7, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 50 mm shaft NTN supplies NF2310EA: one integral rib on each ring; the open execution is rated 5,200 r/min on grease and 7,300 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 110 mm OD and 40 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 5,200 r/min grease and 7,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 50 mm bore. Thermal planning around the 5,200 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 7,300 r/min for continuously high-duty 50 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 50 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2310EA.", "Open NF2310EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Do not replace NF2310EA with a deep-groove ball bearing on rating alone: line contact gives 192 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 192/187 kN pair here belongs to NF2310EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use NF2310EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 192/187 kN ratings, 22.7 kN Pu and 1750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2310EA?", "a": "NF2310EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 192 kN, C0 187 kN, Pu 22.7 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2310EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2310EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2310ea", "＊nf2310ea", "NF2310EA" ], "locale_variants": {} }, { "sku": "NF310", "brand": "NTN", "manufacturer_designation": "NTN NF310", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 96.5, "static_load_kN": 86, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7700, "weight_g": 1110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF310 appears as a 50 mm bore single-row cylindrical roller bearing (96.5 kN C / 86 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF310 reads as NF (one rib on each ring), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 27 mm width and 30.0 mm section put the NF300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 50 mm (1.969 in) bore and 110 mm (4.331 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 27 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NF310; an oversized radius locks the ring on its face and tilts the 27 mm-wide seat.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF310.", "Open NF310 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 96.5/86 kN pair here belongs to NF310 as printed, not to the bare size.", "Open NF310 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 96.5/86 kN ratings, 10.5 kN Pu and 1110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF310?", "a": "NF310 is an NTN NF single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 96.5 kN, C0 86 kN, Pu 10.5 kN, grease limiting speed 6,500 r/min, oil 7,700 r/min, mass about 1110 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF310 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF310 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf310", "＊＊nf310", "NF310" ], "locale_variants": {} }, { "sku": "NF310EA", "brand": "NTN", "manufacturer_designation": "NTN NF310EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 130, "static_load_kN": 113, "fatigue_load_limit_kN": 13.8, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 8300, "weight_g": 1120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF310EA appears as a 50 mm bore single-row cylindrical roller bearing (130 kN C / 113 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NF310EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NF310EA as a pure radial bearing: keep P below 130 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 50 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF310EA.", "Open NF310EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 130/113 kN pair here belongs to NF310EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 130/113 kN ratings, 13.8 kN Pu and 1120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF310EA?", "a": "NF310EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 113 kN, Pu 13.8 kN, grease limiting speed 5,900 r/min, oil 8,300 r/min, mass about 1120 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF310EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF310EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 8,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf310ea", "＊nf310ea", "NF310EA" ], "locale_variants": {} }, { "sku": "NJ2310", "brand": "NTN", "manufacturer_designation": "NTN NJ2310", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 131, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 50 mm shaft NTN supplies NJ2310: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 5,700 r/min on grease and 6,700 r/min on oil. Numbering ties NJ2310 to its envelope: type code NJ, series NJ2300, 50 mm bore; the 110×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 30.0 mm radial section ((110−50)/2) frames the roller complement; capacity per millimetre of bore is about 2.7 kN/mm before application factors. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2310.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2310.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NJ2310 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 134/131 kN ratings, 16 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2310?", "a": "NJ2310 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 131 kN, Pu 16 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2310 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2310 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2310-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2310", "＊＊nj2310", "NJ2310" ], "locale_variants": {} }, { "sku": "NJ2310EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2310EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 187, "fatigue_load_limit_kN": 22.7, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2310EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 192 kN dynamic rating in the 50 mm bore. Digit by digit, NJ2310EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 30.0 mm radial section ((110−50)/2) frames the roller complement; capacity per millimetre of bore is about 3.8 kN/mm before application factors. The 50 mm (1.969 in) bore and 110 mm (4.331 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 40 mm-wide ring. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2310EA.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Grease limiting speed 5,200 r/min and oil 7,300 r/min are different limits for NJ2310EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 192/187 kN ratings, 22.7 kN Pu and 1750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2310EA?", "a": "NJ2310EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 192 kN, C0 187 kN, Pu 22.7 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2310EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2310EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2310ea", "＊nj2310ea", "NJ2310EA" ], "locale_variants": {} }, { "sku": "NJ310", "brand": "NTN", "manufacturer_designation": "NTN NJ310", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 96.5, "static_load_kN": 86, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7700, "weight_g": 1110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ310 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 50×110×27 mm ISO 15 envelope. Numbering ties NJ310 to its envelope: type code NJ, series NJ300, 50 mm bore; the 110×27 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 27 mm width and 30.0 mm section put the NJ300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 96.5 kN C assumes clean oil and adequate film; the 10.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ310.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ310 skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "Do not replace NJ310 with a deep-groove ball bearing on rating alone: line contact gives 96.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Open NJ310 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 96.5/86 kN ratings, 10.5 kN Pu and 1110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ310?", "a": "NJ310 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 96.5 kN, C0 86 kN, Pu 10.5 kN, grease limiting speed 6,500 r/min, oil 7,700 r/min, mass about 1110 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ310 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ310 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ310-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj310", "＊＊nj310", "NJ310" ], "locale_variants": {} }, { "sku": "NJ310EA", "brand": "NTN", "manufacturer_designation": "NTN NJ310EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 130, "static_load_kN": 113, "fatigue_load_limit_kN": 13.8, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 8300, "weight_g": 1120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ310EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 130 kN dynamic rating in the 50 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 65 mm and Ew 97 mm — the envelope inside the 50/110 mm bore/OD where the rollers actually run. The 2.6 kN-per-mm-bore figure (130 kN over 50 mm) lets a NJ310EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ310EA.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 130/113 kN pair here belongs to NJ310EA as printed, not to the bare size.", "Open NJ310EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The NJ rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 110×27 mm envelope matches.", "The 130/113 kN ratings, 13.8 kN Pu and 1120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ310EA?", "a": "NJ310EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 113 kN, Pu 13.8 kN, grease limiting speed 5,900 r/min, oil 8,300 r/min, mass about 1120 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ310EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ310EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 8,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj310ea", "＊nj310ea", "NJ310EA" ], "locale_variants": {} }, { "sku": "NU2310-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2310", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 131, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2310 denotes a 50×110×40 mm (1.969 × 4.331 × 1.575 in) cylindrical roller bearing in the NU2300 family, a pressed sheet-steel cage. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 65 mm and Ew 95 mm — the envelope inside the 50/110 mm bore/OD where the rollers actually run. The 50 mm (1.969 in) bore and 110 mm (4.331 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 40 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2310 non-locating position preloads the bearing when the shaft grows.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2310.", "Do not replace NU2310 with a deep-groove ball bearing on rating alone: line contact gives 134 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NU rib arrangement is not interchangeable with another prefix on the same 50 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×40 mm envelope matches.", "The 134/131 kN ratings, 16 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2310?", "a": "NU2310 is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 131 kN, Pu 16 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2310 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2310 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2310", "＊＊nu2310", "NU2310", "NU2310-NTN" ], "locale_variants": {} }, { "sku": "NU2310EA", "brand": "NTN", "manufacturer_designation": "NTN NU2310EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 187, "fatigue_load_limit_kN": 22.7, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2310EA on the 50×110 mm envelope, 40 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,200 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2310EA floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NU2310EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 22.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.97 (187/192 kN) shows the high-static-capacity proportioning of this 50 mm bore. Housing and shaft fillets must clear the ring chamfers of NU2310EA; an oversized radius locks the ring on its face and tilts the 40 mm-wide seat.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2310EA.", "The NU rib arrangement is not interchangeable with another prefix on the same 50 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×40 mm envelope matches.", "The NU rib arrangement is not interchangeable with another prefix on the same 50 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×40 mm envelope matches.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "Do not replace NU2310EA with a deep-groove ball bearing on rating alone: line contact gives 192 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 192/187 kN ratings, 22.7 kN Pu and 1750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2310EA?", "a": "NU2310EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 192 kN, C0 187 kN, Pu 22.7 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2310EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2310EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2310ea", "＊nu2310ea", "NU2310EA" ], "locale_variants": {} }, { "sku": "NU310-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU310", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 96.5, "static_load_kN": 86, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7700, "weight_g": 1110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU310 appears as a 50 mm bore single-row cylindrical roller bearing (96.5 kN C / 86 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NU310 to its envelope: type code NU, series NU300, 50 mm bore; the 110×27 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 6,500 r/min grease and 7,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 50 mm bore. The 50 mm (1.969 in) bore and 110 mm (4.331 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 27 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU310 non-locating position preloads the bearing when the shaft grows.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU310.", "If the shaft must be located both ways, do not use NU310 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "The 27 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "If the shaft must be located both ways, do not use NU310 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 96.5/86 kN ratings, 10.5 kN Pu and 1110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU310?", "a": "NU310 is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 96.5 kN, C0 86 kN, Pu 10.5 kN, grease limiting speed 6,500 r/min, oil 7,700 r/min, mass about 1110 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU310 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU310 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu310", "＊＊nu310", "NU310", "NU310-NTN" ], "locale_variants": {} }, { "sku": "NU310EA", "brand": "NTN", "manufacturer_designation": "NTN NU310EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 130, "static_load_kN": 113, "fatigue_load_limit_kN": 13.8, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 8300, "weight_g": 1120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU310EA denotes a 50×110×27 mm (1.969 × 4.331 × 1.063 in) cylindrical roller bearing in the NU300 family, the EA high-capacity pressed sheet-steel cage. Numbering ties NU310EA to its envelope: type code NU, series NU300, 50 mm bore; the 110×27 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 27 mm width and 30.0 mm section put the NU300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU310EA.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 27 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU310EA skids at 5,900 r/min and fails by smearing long before L10 fatigue.", "The NU rib arrangement is not interchangeable with another prefix on the same 50 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×27 mm envelope matches.", "Open NU310EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "The 130/113 kN ratings, 13.8 kN Pu and 1120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU310EA?", "a": "NU310EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 113 kN, Pu 13.8 kN, grease limiting speed 5,900 r/min, oil 8,300 r/min, mass about 1120 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU310EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU310EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 8,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu310ea", "＊nu310ea", "NU310EA" ], "locale_variants": {} }, { "sku": "NUP2310", "brand": "NTN", "manufacturer_designation": "NTN NUP2310", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 131, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 1670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2310 on the 50×110 mm envelope, 40 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,700 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2310 floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2310 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 16 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.98 (131/134 kN) shows the high-static-capacity proportioning of this 50 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2310 non-locating position preloads the bearing when the shaft grows.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2310.", "Do not replace NUP2310 with a deep-groove ball bearing on rating alone: line contact gives 134 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 134/131 kN pair here belongs to NUP2310 as printed, not to the bare size.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Do not replace NUP2310 with a deep-groove ball bearing on rating alone: line contact gives 134 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 134/131 kN ratings, 16 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2310?", "a": "NUP2310 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 131 kN, Pu 16 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 1670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2310 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2310 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2310-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2310", "＊＊nup2310", "NUP2310" ], "locale_variants": {} }, { "sku": "NUP2310EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2310EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 187, "fatigue_load_limit_kN": 22.7, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2310EA is the extra-wide (23) section of the NTN NUP2300 dimension series for a 50 mm shaft — 192 kN of basic dynamic capacity in a 1750 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 110 mm OD and 40 mm width from the ISO 15 general plan. With C 192 kN and C0 187 kN (C0/C ≈ 0.97) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 192 kN C assumes clean oil and adequate film; the 22.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2310EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2310EA.", "The 30.0 mm section at 50 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2310EA skids at 5,200 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2310EA skids at 5,200 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2310EA skids at 5,200 r/min and fails by smearing long before L10 fatigue.", "The 192/187 kN ratings, 22.7 kN Pu and 1750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2310EA?", "a": "NUP2310EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 192 kN, C0 187 kN, Pu 22.7 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2310EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2310EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2310ea", "＊nup2310ea", "NUP2310EA" ], "locale_variants": {} }, { "sku": "NUP310", "brand": "NTN", "manufacturer_designation": "NTN NUP310", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 96.5, "static_load_kN": 86, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7700, "weight_g": 1110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP310 is the standard section of the NTN NUP300 dimension series for a 50 mm shaft — 96.5 kN of basic dynamic capacity in a 1110 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 110 mm OD and 27 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP310 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 10.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.89 (86/96.5 kN) shows the high-static-capacity proportioning of this 50 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP310.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP310.", "Open NUP310 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Grease limiting speed 6,500 r/min and oil 7,700 r/min are different limits for NUP310: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 96.5/86 kN ratings, 10.5 kN Pu and 1110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP310 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP310?", "a": "NUP310 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 96.5 kN, C0 86 kN, Pu 10.5 kN, grease limiting speed 6,500 r/min, oil 7,700 r/min, mass about 1110 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP310 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP310 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP310 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP310?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 95 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP310-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup310", "＊＊nup310", "NUP310" ], "locale_variants": {} }, { "sku": "NUP310EA", "brand": "NTN", "manufacturer_designation": "NTN NUP310EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 130, "static_load_kN": 113, "fatigue_load_limit_kN": 13.8, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 8300, "weight_g": 1120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP310EA is the standard section of the NTN NUP300 dimension series for a 50 mm shaft — 130 kN of basic dynamic capacity in a 1120 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP310EA floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 65 mm and Ew 97 mm — the envelope inside the 50/110 mm bore/OD where the rollers actually run. Thermal planning around the 5,900 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 8,300 r/min for continuously high-duty 50 mm positions. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP310EA.", "The 27 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "Do not replace NUP310EA with a deep-groove ball bearing on rating alone: line contact gives 130 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 27 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 50 mm inner ring.", "The NUP rib arrangement is not interchangeable with another prefix on the same 50 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 110×27 mm envelope matches.", "The 130/113 kN ratings, 13.8 kN Pu and 1120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP310EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP310EA?", "a": "NUP310EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 113 kN, Pu 13.8 kN, grease limiting speed 5,900 r/min, oil 8,300 r/min, mass about 1120 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP310EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP310EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP310EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 65 mm, Ew 97 mm. The nominal bore/OD remain 50/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 8,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP310EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup310ea", "＊nup310ea", "NUP310EA" ], "locale_variants": {} }, { "sku": "N410", "brand": "NTN", "manufacturer_designation": "NTN N410", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 143, "static_load_kN": 124, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1970, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N410 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 50×130×31 mm ISO 15 envelope. Digit by digit, N410 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 4,700 r/min grease and 5,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 50 mm bore. Thermal planning around the 4,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,500 r/min for continuously high-duty 50 mm positions. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N410.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N410 skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace N410 with a deep-groove ball bearing on rating alone: line contact gives 143 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use N410 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 143/124 kN ratings, 15.1 kN Pu and 1970 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N410 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N410?", "a": "N410 is an NTN N single-row cylindrical roller bearing to ISO 15: 50 mm bore, 130 mm OD and 31 mm width (1.969 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 143 kN, C0 124 kN, Pu 15.1 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1970 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N410 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N410 is supplied in the standard open execution shown in the table." }, { "q": "Can N410 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N410?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.8 mm, Ew 110.8 mm. The nominal bore/OD remain 50/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N410", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n410", "N410" ], "locale_variants": {} }, { "sku": "NF410", "brand": "NTN", "manufacturer_designation": "NTN NF410", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 143, "static_load_kN": 124, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1970, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF410 is the heavy (04) section of the NTN NF400 dimension series for a 50 mm shaft — 143 kN of basic dynamic capacity in a 1970 g, open bearing. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 50 mm, with 130 mm OD and 31 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF410. Mass 1970 g for the 50×130×31 mm NF410 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NF410; an oversized radius locks the ring on its face and tilts the 31 mm-wide seat.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF410.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The NF rib arrangement is not interchangeable with another prefix on the same 50 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 130×31 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The 143/124 kN ratings, 15.1 kN Pu and 1970 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF410 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF410?", "a": "NF410 is an NTN NF single-row cylindrical roller bearing to ISO 15: 50 mm bore, 130 mm OD and 31 mm width (1.969 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 143 kN, C0 124 kN, Pu 15.1 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1970 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF410 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF410 is supplied in the standard open execution shown in the table." }, { "q": "Can NF410 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF410?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.8 mm, Ew 110.8 mm. The nominal bore/OD remain 50/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF410", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf410", "NF410" ], "locale_variants": {} }, { "sku": "NJ410-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ410", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 143, "static_load_kN": 124, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1970, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ410 appears as a 50 mm bore single-row cylindrical roller bearing (143 kN C / 124 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ410 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 50 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ410. Speed ratio check: limiting 4,700 r/min is .85 of the 5,500 r/min oil value for NJ410; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ410 non-locating position preloads the bearing when the shaft grows.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ410.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 143/124 kN pair here belongs to NJ410 as printed, not to the bare size.", "Do not replace NJ410 with a deep-groove ball bearing on rating alone: line contact gives 143 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NJ410 with a deep-groove ball bearing on rating alone: line contact gives 143 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The 143/124 kN ratings, 15.1 kN Pu and 1970 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ410 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ410?", "a": "NJ410 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 130 mm OD and 31 mm width (1.969 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 143 kN, C0 124 kN, Pu 15.1 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1970 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ410 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ410 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ410 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ410?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.8 mm, Ew 110.8 mm. The nominal bore/OD remain 50/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ410", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj410", "NJ410", "NJ410-NTN" ], "locale_variants": {} }, { "sku": "NU410-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU410", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 143, "static_load_kN": 124, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1970, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU410 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 50×130×31 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU410 floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Thermal planning around the 4,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,500 r/min for continuously high-duty 50 mm positions. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU410.", "Open NU410 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 50 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU410 skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 143/124 kN pair here belongs to NU410 as printed, not to the bare size.", "The 143/124 kN ratings, 15.1 kN Pu and 1970 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU410 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU410?", "a": "NU410 is an NTN NU single-row cylindrical roller bearing to ISO 15: 50 mm bore, 130 mm OD and 31 mm width (1.969 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 143 kN, C0 124 kN, Pu 15.1 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1970 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU410 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU410 is supplied in the standard open execution shown in the table." }, { "q": "Can NU410 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU410?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.8 mm, Ew 110.8 mm. The nominal bore/OD remain 50/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU410", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu410", "NU410", "NU410-NTN" ], "locale_variants": {} }, { "sku": "NUP410", "brand": "NTN", "manufacturer_designation": "NTN NUP410", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 143, "static_load_kN": 124, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1970, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP410 denotes a 50×130×31 mm (1.969 × 5.118 × 1.22 in) cylindrical roller bearing in the NUP400 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP410 floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP410 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 1970 g for the 50×130×31 mm NUP410 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 50 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP410.", "If the shaft must be located both ways, do not use NUP410 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NUP400 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 50 mm bore share bore but not OD/width; check the full NUP400 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NUP410 with a deep-groove ball bearing on rating alone: line contact gives 143 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 143/124 kN ratings, 15.1 kN Pu and 1970 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP410 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP410?", "a": "NUP410 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 50 mm bore, 130 mm OD and 31 mm width (1.969 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 143 kN, C0 124 kN, Pu 15.1 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1970 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP410 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP410 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP410 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP410?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.8 mm, Ew 110.8 mm. The nominal bore/OD remain 50/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP410", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup410", "NUP410" ], "locale_variants": {} }, { "sku": "N1011", "brand": "NTN", "manufacturer_designation": "NTN N1011", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 44, "fatigue_load_limit_kN": 5.35, "limiting_speed_rpm": 8200, "max_rpm": 8200, "speed_oil_rpm": 9700, "weight_g": 435, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1011 is the extra-light (10/49) section of the NTN N1000 dimension series for a 55 mm shaft — 42 kN of basic dynamic capacity in a 435 g, open bearing. Digit by digit, N1011 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 8,200 r/min grease and 9,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. The 0.8 kN-per-mm-bore figure (42 kN over 55 mm) lets a N1011 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 55 mm shaft.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N1011.", "If the shaft must be located both ways, do not use N1011 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The N rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 90×18 mm envelope matches.", "Open N1011 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "If the shaft must be located both ways, do not use N1011 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 42/44 kN ratings, 5.35 kN Pu and 435 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1011 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1011?", "a": "N1011 is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 90 mm OD and 18 mm width (2.165 × 3.543 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 44 kN, Pu 5.35 kN, grease limiting speed 8,200 r/min, oil 9,700 r/min, mass about 435 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1011 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1011 is supplied in the standard open execution shown in the table." }, { "q": "Can N1011 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1011?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 80.5 mm. The nominal bore/OD remain 55/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,200 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1011", "N1011" ], "locale_variants": {} }, { "sku": "NJ1011", "brand": "NTN", "manufacturer_designation": "NTN NJ1011", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 44, "fatigue_load_limit_kN": 5.35, "limiting_speed_rpm": 8200, "max_rpm": 8200, "speed_oil_rpm": 9700, "weight_g": 435, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1011 appears as a 55 mm bore single-row cylindrical roller bearing (42 kN C / 44 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 64.5 mm and Ew 80.5 mm — the envelope inside the 55/90 mm bore/OD where the rollers actually run. The 55 mm (2.165 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 18 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1011.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ1011.", "The NJ rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 90×18 mm envelope matches.", "Grease limiting speed 8,200 r/min and oil 9,700 r/min are different limits for NJ1011: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NJ1011 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 90×18 mm envelope matches.", "The 42/44 kN ratings, 5.35 kN Pu and 435 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1011 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1011?", "a": "NJ1011 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 90 mm OD and 18 mm width (2.165 × 3.543 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 44 kN, Pu 5.35 kN, grease limiting speed 8,200 r/min, oil 9,700 r/min, mass about 435 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1011 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1011 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1011 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1011?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 80.5 mm. The nominal bore/OD remain 55/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,200 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1011-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1011", "NJ1011" ], "locale_variants": {} }, { "sku": "NN3011", "brand": "NTN", "manufacturer_designation": "NTN NN3011", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 77, "static_load_kN": 96.5, "fatigue_load_limit_kN": 11.8, "limiting_speed_rpm": 7300, "max_rpm": 7300, "speed_oil_rpm": 8600, "weight_g": 651, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NN3011: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 7,300 r/min on grease and 8,600 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 90 mm OD and 26 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 7,300 r/min grease and 8,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. Selection arithmetic: Pu 11.8 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (96.5/77 kN) shows the high-static-capacity proportioning of this 55 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3011 non-locating position preloads the bearing when the shaft grows.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3011.", "Grease limiting speed 7,300 r/min and oil 8,600 r/min are different limits for NN3011: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 90 mm race brinells and releases as vibration within hours.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3011 does not substitute a precision-class execution.", "The 77/96.5 kN ratings, 11.8 kN Pu and 651 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3011 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3011?", "a": "NN3011 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 55 mm bore, 90 mm OD and 26 mm width (2.165 × 3.543 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 77 kN, C0 96.5 kN, Pu 11.8 kN, grease limiting speed 7,300 r/min, oil 8,600 r/min, mass about 651 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3011 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3011 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3011?", "a": "NN3011 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3011?", "a": "NTN rates NN3011 at 7,300 r/min with grease and 8,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3011", "NN3011" ], "locale_variants": {} }, { "sku": "NN3011K", "brand": "NTN", "manufacturer_designation": "NTN NN3011K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 77, "static_load_kN": 96.5, "fatigue_load_limit_kN": 11.8, "limiting_speed_rpm": 7300, "max_rpm": 7300, "speed_oil_rpm": 8600, "weight_g": 631, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN3011K denotes a 55×90×26 mm (2.165 × 3.543 × 1.024 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 90 mm OD and 26 mm width from the ISO 15 general plan. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. The 55 mm (2.165 in) bore and 90 mm (3.543 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 26 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NN3011K; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3011K.", "The NN rib arrangement is not interchangeable with another prefix on the same 55 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 90×26 mm envelope matches.", "Open NN3011K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "Do not replace NN3011K with a deep-groove ball bearing on rating alone: line contact gives 77 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 77/96.5 kN ratings, 11.8 kN Pu and 631 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3011K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3011K?", "a": "NN3011K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 55 mm bore, 90 mm OD and 26 mm width (2.165 × 3.543 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 77 kN, C0 96.5 kN, Pu 11.8 kN, grease limiting speed 7,300 r/min, oil 8,600 r/min, mass about 631 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3011K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3011K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3011K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3011K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3011 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3011K?", "a": "NTN rates NN3011K at 7,300 r/min with grease and 8,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3011K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3011k", "NN3011K" ], "locale_variants": {} }, { "sku": "NU1011", "brand": "NTN", "manufacturer_designation": "NTN NU1011", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 44, "fatigue_load_limit_kN": 5.35, "limiting_speed_rpm": 8200, "max_rpm": 8200, "speed_oil_rpm": 9700, "weight_g": 435, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NU1011: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 8,200 r/min on grease and 9,700 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 90 mm OD and 18 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU1011 designation when purchasing. Thermal planning around the 8,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 9,700 r/min for continuously high-duty 55 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1011 non-locating position preloads the bearing when the shaft grows.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU1011.", "The 17.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 55 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 90×18 mm envelope matches.", "If the shaft must be located both ways, do not use NU1011 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 42/44 kN ratings, 5.35 kN Pu and 435 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1011 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1011?", "a": "NU1011 is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 90 mm OD and 18 mm width (2.165 × 3.543 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 44 kN, Pu 5.35 kN, grease limiting speed 8,200 r/min, oil 9,700 r/min, mass about 435 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1011 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1011 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1011 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1011?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 80.5 mm. The nominal bore/OD remain 55/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,200 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1011-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1011", "NU1011" ], "locale_variants": {} }, { "sku": "NUP1011", "brand": "NTN", "manufacturer_designation": "NTN NUP1011", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 44, "fatigue_load_limit_kN": 5.35, "limiting_speed_rpm": 8200, "max_rpm": 8200, "speed_oil_rpm": 9700, "weight_g": 435, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NUP1011: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 8,200 r/min on grease and 9,700 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 90 mm OD and 18 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 8,200 r/min grease and 9,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. Equivalent-load planning treats NUP1011 as a pure radial bearing: keep P below 42 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP1011.", "The 17.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "Grease limiting speed 8,200 r/min and oil 9,700 r/min are different limits for NUP1011: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 8,200 r/min and oil 9,700 r/min are different limits for NUP1011: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NUP1011 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 42/44 kN ratings, 5.35 kN Pu and 435 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1011 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1011?", "a": "NUP1011 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 90 mm OD and 18 mm width (2.165 × 3.543 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 44 kN, Pu 5.35 kN, grease limiting speed 8,200 r/min, oil 9,700 r/min, mass about 435 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1011 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1011 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1011 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1011?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 80.5 mm. The nominal bore/OD remain 55/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,200 r/min grease / 9,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1011", "NUP1011" ], "locale_variants": {} }, { "sku": "N211", "brand": "NTN", "manufacturer_designation": "NTN N211", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62.5, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8200, "weight_g": 626, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies N211: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 6,900 r/min on grease and 8,200 r/min on oil. Digit by digit, N211 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded N211 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 626 g for the 55×100×21 mm N211 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N211.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N211.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The N rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×21 mm envelope matches.", "The 22.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 21 mm-wide cavity.", "Do not replace N211 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 64.5/62.5 kN ratings, 7.6 kN Pu and 626 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N211?", "a": "N211 is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62.5 kN, Pu 7.6 kN, grease limiting speed 6,900 r/min, oil 8,200 r/min, mass about 626 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N211 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N211 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N211-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n211", "＊＊n211", "N211" ], "locale_variants": {} }, { "sku": "N211EA", "brand": "NTN", "manufacturer_designation": "NTN N211EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 102, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 8900, "weight_g": 635, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N211EA denotes a 55×100×21 mm (2.165 × 3.937 × 0.827 in) cylindrical roller bearing in the N200 family, the EA high-capacity pressed sheet-steel cage. Numbering ties N211EA to its envelope: type code N, series N200, 55 mm bore; the 100×21 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 21 mm width and 22.5 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 55 mm (2.165 in) bore and 100 mm (3.937 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 21 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N211EA.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N211EA.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N211EA skids at 6,300 r/min and fails by smearing long before L10 fatigue.", "The N rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×21 mm envelope matches.", "Open N211EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The 102/98.5 kN ratings, 12 kN Pu and 635 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N211EA?", "a": "N211EA is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 102 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,300 r/min, oil 8,900 r/min, mass about 635 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N211EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N211EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 8,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n211ea", "＊n211ea", "N211EA" ], "locale_variants": {} }, { "sku": "N2211", "brand": "NTN", "manufacturer_designation": "NTN N2211", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 87, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 758, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2211 denotes a 55×100×25 mm (2.165 × 3.937 × 0.984 in) cylindrical roller bearing in the N2200 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N2211 floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. At 7,400 r/min with oil versus 6,300 r/min with grease (a 1,100 r/min band), lubrication choice for N2211 is a thermal decision, not just a sealing one. The 1.5 kN-per-mm-bore figure (83.5 kN over 55 mm) lets a N2211 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2211.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2211.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2211 skids at 6,300 r/min and fails by smearing long before L10 fatigue.", "Do not replace N2211 with a deep-groove ball bearing on rating alone: line contact gives 83.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 6,300 r/min and oil 7,400 r/min are different limits for N2211: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 6,300 r/min and oil 7,400 r/min are different limits for N2211: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 83.5/87 kN ratings, 10.6 kN Pu and 758 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2211?", "a": "N2211 is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 87 kN, Pu 10.6 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 758 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2211 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2211 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2211", "＊＊n2211", "N2211" ], "locale_variants": {} }, { "sku": "N2211EA", "brand": "NTN", "manufacturer_designation": "NTN N2211EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 120, "static_load_kN": 122, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "speed_oil_rpm": 7900, "weight_g": 805, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2211EA on the 55×100 mm envelope, 25 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,600 r/min. Digit by digit, N2211EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 7,900 r/min with oil versus 5,600 r/min with grease (a 2,300 r/min band), lubrication choice for N2211EA is a thermal decision, not just a sealing one. Speed ratio check: limiting 5,600 r/min is .71 of the 7,900 r/min oil value for N2211EA; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2211EA.", "Grease limiting speed 5,600 r/min and oil 7,900 r/min are different limits for N2211EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The N rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×25 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 5,600 r/min and oil 7,900 r/min are different limits for N2211EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 120/122 kN ratings, 14.8 kN Pu and 805 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2211EA?", "a": "N2211EA is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 120 kN, C0 122 kN, Pu 14.8 kN, grease limiting speed 5,600 r/min, oil 7,900 r/min, mass about 805 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2211EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2211EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,600 r/min grease / 7,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2211ea", "＊n2211ea", "N2211EA" ], "locale_variants": {} }, { "sku": "NF211", "brand": "NTN", "manufacturer_designation": "NTN NF211", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62.5, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8200, "weight_g": 626, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF211 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 55×100×21 mm ISO 15 envelope. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 100 mm OD and 21 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NF211 designation when purchasing. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 55 mm shaft.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF211.", "Do not replace NF211 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NF211 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "Do not replace NF211 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 64.5/62.5 kN ratings, 7.6 kN Pu and 626 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF211?", "a": "NF211 is an NTN NF single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62.5 kN, Pu 7.6 kN, grease limiting speed 6,900 r/min, oil 8,200 r/min, mass about 626 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF211 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF211 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf211", "＊＊nf211", "NF211" ], "locale_variants": {} }, { "sku": "NF211EA", "brand": "NTN", "manufacturer_designation": "NTN NF211EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 102, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 8900, "weight_g": 635, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF211EA on the 55×100 mm envelope, 21 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 6,300 r/min. Digit by digit, NF211EA reads as NF (one rib on each ring), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 22.5 mm radial section ((100−55)/2) frames the roller complement; capacity per millimetre of bore is about 1.9 kN/mm before application factors. Mass 635 g for the 55×100×21 mm NF211EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 55 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF211EA.", "If the shaft must be located both ways, do not use NF211EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The NF rib arrangement is not interchangeable with another prefix on the same 55 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 100×21 mm envelope matches.", "The 22.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 21 mm-wide cavity.", "The 102/98.5 kN ratings, 12 kN Pu and 635 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF211EA?", "a": "NF211EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 102 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,300 r/min, oil 8,900 r/min, mass about 635 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF211EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF211EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 8,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf211ea", "＊nf211ea", "NF211EA" ], "locale_variants": {} }, { "sku": "NF2211EA", "brand": "NTN", "manufacturer_designation": "NTN NF2211EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 120, "static_load_kN": 122, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "speed_oil_rpm": 7900, "weight_g": 805, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2211EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 55×100×25 mm ISO 15 envelope. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF2211EA floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. At 7,900 r/min with oil versus 5,600 r/min with grease (a 2,300 r/min band), lubrication choice for NF2211EA is a thermal decision, not just a sealing one. Speed ratio check: limiting 5,600 r/min is .71 of the 7,900 r/min oil value for NF2211EA; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NF2211EA; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2211EA.", "If the shaft must be located both ways, do not use NF2211EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Grease limiting speed 5,600 r/min and oil 7,900 r/min are different limits for NF2211EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 120/122 kN ratings, 14.8 kN Pu and 805 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2211EA?", "a": "NF2211EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 120 kN, C0 122 kN, Pu 14.8 kN, grease limiting speed 5,600 r/min, oil 7,900 r/min, mass about 805 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2211EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2211EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,600 r/min grease / 7,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2211ea", "＊nf2211ea", "NF2211EA" ], "locale_variants": {} }, { "sku": "NJ211", "brand": "NTN", "manufacturer_designation": "NTN NJ211", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62.5, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8200, "weight_g": 626, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ211 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 64.5 kN dynamic rating in the 55 mm bore. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 100 mm OD and 21 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NJ211 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 626 g for the 55×100×21 mm NJ211 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 55 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ211.", "The NJ rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 100×21 mm envelope matches.", "If the shaft must be located both ways, do not use NJ211 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Do not replace NJ211 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 64.5/62.5 kN ratings, 7.6 kN Pu and 626 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ211?", "a": "NJ211 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62.5 kN, Pu 7.6 kN, grease limiting speed 6,900 r/min, oil 8,200 r/min, mass about 626 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ211 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ211 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ211-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj211", "＊＊nj211", "NJ211" ], "locale_variants": {} }, { "sku": "NJ211EA", "brand": "NTN", "manufacturer_designation": "NTN NJ211EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 102, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 8900, "weight_g": 635, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ211EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 55×100×21 mm ISO 15 envelope. Digit by digit, NJ211EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ211EA. Rating life at 102 kN C assumes clean oil and adequate film; the 12 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ211EA.", "Do not replace NJ211EA with a deep-groove ball bearing on rating alone: line contact gives 102 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ211EA skids at 6,300 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 102/98.5 kN ratings, 12 kN Pu and 635 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ211EA?", "a": "NJ211EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 102 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,300 r/min, oil 8,900 r/min, mass about 635 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ211EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ211EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 8,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj211ea", "＊nj211ea", "NJ211EA" ], "locale_variants": {} }, { "sku": "NJ2211", "brand": "NTN", "manufacturer_designation": "NTN NJ2211", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 87, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 758, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2211 is the wide (22) section of the NTN NJ2200 dimension series for a 55 mm shaft — 83.5 kN of basic dynamic capacity in a 758 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 100 mm OD and 25 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NJ2211 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 83.5 kN C assumes clean oil and adequate film; the 10.6 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 55 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2211.", "The 22.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 25 mm-wide cavity.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "If the shaft must be located both ways, do not use NJ2211 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NJ2211 with a deep-groove ball bearing on rating alone: line contact gives 83.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 83.5/87 kN ratings, 10.6 kN Pu and 758 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2211?", "a": "NJ2211 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 87 kN, Pu 10.6 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 758 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2211 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2211 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2211-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2211", "＊＊nj2211", "NJ2211" ], "locale_variants": {} }, { "sku": "NJ2211EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2211EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 120, "static_load_kN": 122, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "speed_oil_rpm": 7900, "weight_g": 805, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2211EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 55×100×25 mm ISO 15 envelope. Numbering ties NJ2211EA to its envelope: type code NJ, series NJ2200, 55 mm bore; the 100×25 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 2.2 kN-per-mm-bore figure (120 kN over 55 mm) lets a NJ2211EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2211EA.", "The NJ rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 100×25 mm envelope matches.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The NJ rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 100×25 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 120/122 kN pair here belongs to NJ2211EA as printed, not to the bare size.", "The 120/122 kN ratings, 14.8 kN Pu and 805 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2211EA?", "a": "NJ2211EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 120 kN, C0 122 kN, Pu 14.8 kN, grease limiting speed 5,600 r/min, oil 7,900 r/min, mass about 805 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2211EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2211EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,600 r/min grease / 7,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2211ea", "＊nj2211ea", "NJ2211EA" ], "locale_variants": {} }, { "sku": "NU211-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU211", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62.5, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8200, "weight_g": 626, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU211 appears as a 55 mm bore single-row cylindrical roller bearing (64.5 kN C / 62.5 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU211 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 64.5 kN and C0 62.5 kN (C0/C ≈ 0.97) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU211 non-locating position preloads the bearing when the shaft grows.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU211.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU211 skids at 6,900 r/min and fails by smearing long before L10 fatigue.", "The NU rib arrangement is not interchangeable with another prefix on the same 55 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×21 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 64.5/62.5 kN pair here belongs to NU211 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU211 skids at 6,900 r/min and fails by smearing long before L10 fatigue.", "The 64.5/62.5 kN ratings, 7.6 kN Pu and 626 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU211?", "a": "NU211 is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62.5 kN, Pu 7.6 kN, grease limiting speed 6,900 r/min, oil 8,200 r/min, mass about 626 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU211 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU211 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu211", "＊＊nu211", "NU211", "NU211-NTN" ], "locale_variants": {} }, { "sku": "NU211EA", "brand": "NTN", "manufacturer_designation": "NTN NU211EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 102, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 8900, "weight_g": 635, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU211EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 102 kN dynamic rating in the 55 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 100 mm OD and 21 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NU211EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 6,300 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 8,900 r/min for continuously high-duty 55 mm positions. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU211EA.", "Open NU211EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "If the shaft must be located both ways, do not use NU211EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU211EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 102/98.5 kN ratings, 12 kN Pu and 635 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU211EA?", "a": "NU211EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 102 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,300 r/min, oil 8,900 r/min, mass about 635 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU211EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU211EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 8,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu211ea", "＊nu211ea", "NU211EA" ], "locale_variants": {} }, { "sku": "NU2211-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2211", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 87, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 758, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2211 denotes a 55×100×25 mm (2.165 × 3.937 × 0.984 in) cylindrical roller bearing in the NU2200 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2211 floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. The 22.5 mm radial section ((100−55)/2) frames the roller complement; capacity per millimetre of bore is about 1.5 kN/mm before application factors. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2211 non-locating position preloads the bearing when the shaft grows.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2211.", "The NU rib arrangement is not interchangeable with another prefix on the same 55 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×25 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 22.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 25 mm-wide cavity.", "The 83.5/87 kN ratings, 10.6 kN Pu and 758 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2211?", "a": "NU2211 is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 87 kN, Pu 10.6 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 758 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2211 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2211 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2211", "＊＊nu2211", "NU2211", "NU2211-NTN" ], "locale_variants": {} }, { "sku": "NU2211EA", "brand": "NTN", "manufacturer_designation": "NTN NU2211EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 120, "static_load_kN": 122, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "speed_oil_rpm": 7900, "weight_g": 805, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2211EA is the wide (22) section of the NTN NU2200 dimension series for a 55 mm shaft — 120 kN of basic dynamic capacity in a 805 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). The 25 mm width and 22.5 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NU2211EA as a pure radial bearing: keep P below 120 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU2211EA; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2211EA.", "Grease limiting speed 5,600 r/min and oil 7,900 r/min are different limits for NU2211EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NU2211EA with a deep-groove ball bearing on rating alone: line contact gives 120 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Open NU2211EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The 120/122 kN ratings, 14.8 kN Pu and 805 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2211EA?", "a": "NU2211EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 120 kN, C0 122 kN, Pu 14.8 kN, grease limiting speed 5,600 r/min, oil 7,900 r/min, mass about 805 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2211EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2211EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,600 r/min grease / 7,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2211ea", "＊nu2211ea", "NU2211EA" ], "locale_variants": {} }, { "sku": "NUP211", "brand": "NTN", "manufacturer_designation": "NTN NUP211", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 62.5, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 6900, "max_rpm": 6900, "speed_oil_rpm": 8200, "weight_g": 626, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP211 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 55×100×21 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP211 floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 66.5 mm and Ew 88.5 mm — the envelope inside the 55/100 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP211.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 6,900 r/min and oil 8,200 r/min are different limits for NUP211: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NUP rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 100×21 mm envelope matches.", "The 64.5/62.5 kN ratings, 7.6 kN Pu and 626 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP211?", "a": "NUP211 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 62.5 kN, Pu 7.6 kN, grease limiting speed 6,900 r/min, oil 8,200 r/min, mass about 626 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP211 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP211 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP211-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup211", "＊＊nup211", "NUP211" ], "locale_variants": {} }, { "sku": "NUP211EA", "brand": "NTN", "manufacturer_designation": "NTN NUP211EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 102, "static_load_kN": 98.5, "fatigue_load_limit_kN": 12, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 8900, "weight_g": 635, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NUP211EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 6,300 r/min on grease and 8,900 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP211EA floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP211EA. The 1.9 kN-per-mm-bore figure (102 kN over 55 mm) lets a NUP211EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP211EA.", "The 21 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 102/98.5 kN pair here belongs to NUP211EA as printed, not to the bare size.", "The 22.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 21 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 102/98.5 kN ratings, 12 kN Pu and 635 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP211EA?", "a": "NUP211EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 21 mm width (2.165 × 3.937 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 102 kN, C0 98.5 kN, Pu 12 kN, grease limiting speed 6,300 r/min, oil 8,900 r/min, mass about 635 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP211EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP211EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 8,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup211ea", "＊nup211ea", "NUP211EA" ], "locale_variants": {} }, { "sku": "NUP2211", "brand": "NTN", "manufacturer_designation": "NTN NUP2211", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83.5, "static_load_kN": 87, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 6300, "max_rpm": 6300, "speed_oil_rpm": 7400, "weight_g": 758, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2211 appears as a 55 mm bore single-row cylindrical roller bearing (83.5 kN C / 87 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 6,300 r/min grease and 7,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Housing and shaft fillets must clear the ring chamfers of NUP2211; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2211.", "Open NUP2211 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The 22.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 25 mm-wide cavity.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "If the shaft must be located both ways, do not use NUP2211 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 83.5/87 kN ratings, 10.6 kN Pu and 758 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2211 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2211?", "a": "NUP2211 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83.5 kN, C0 87 kN, Pu 10.6 kN, grease limiting speed 6,300 r/min, oil 7,400 r/min, mass about 758 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2211 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2211 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2211 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2211?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66.5 mm, Ew 88.5 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,300 r/min grease / 7,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2211-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2211", "＊＊nup2211", "NUP2211" ], "locale_variants": {} }, { "sku": "NUP2211EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2211EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 120, "static_load_kN": 122, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "speed_oil_rpm": 7900, "weight_g": 805, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NUP2211EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,600 r/min on grease and 7,900 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 100 mm OD and 25 mm width from the ISO 15 general plan. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP2211EA designation when purchasing. Selection arithmetic: Pu 14.8 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.02 (122/120 kN) shows the high-static-capacity proportioning of this 55 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2211EA.", "The 22.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 25 mm-wide cavity.", "If the shaft must be located both ways, do not use NUP2211EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 120/122 kN pair here belongs to NUP2211EA as printed, not to the bare size.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 120/122 kN ratings, 14.8 kN Pu and 805 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2211EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2211EA?", "a": "NUP2211EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 120 kN, C0 122 kN, Pu 14.8 kN, grease limiting speed 5,600 r/min, oil 7,900 r/min, mass about 805 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2211EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2211EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2211EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 66 mm, Ew 90 mm. The nominal bore/OD remain 55/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,600 r/min grease / 7,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2211EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2211ea", "＊nup2211ea", "NUP2211EA" ], "locale_variants": {} }, { "sku": "N2311", "brand": "NTN", "manufacturer_designation": "NTN N2311", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 164, "static_load_kN": 162, "fatigue_load_limit_kN": 19.8, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 6100, "weight_g": 2130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2311 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 55×120×43 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). The 43 mm width and 32.5 mm section put the N2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 5,200 r/min is .85 of the 6,100 r/min oil value for N2311; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2311.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2311.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 164/162 kN pair here belongs to N2311 as printed, not to the bare size.", "Grease limiting speed 5,200 r/min and oil 6,100 r/min are different limits for N2311: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 43 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Open N2311 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The 164/162 kN ratings, 19.8 kN Pu and 2130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2311?", "a": "N2311 is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 164 kN, C0 162 kN, Pu 19.8 kN, grease limiting speed 5,200 r/min, oil 6,100 r/min, mass about 2130 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2311 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2311 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2311", "＊＊n2311", "N2311" ], "locale_variants": {} }, { "sku": "N2311EA", "brand": "NTN", "manufacturer_designation": "NTN N2311EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 238, "static_load_kN": 233, "fatigue_load_limit_kN": 28.4, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6700, "weight_g": 2230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2311EA is the extra-wide (23) section of the NTN N2300 dimension series for a 55 mm shaft — 238 kN of basic dynamic capacity in a 2230 g, open bearing. Numbering ties N2311EA to its envelope: type code N, series N2300, 55 mm bore; the 120×43 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2311EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N2311EA.", "The 32.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Open N2311EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "Do not replace N2311EA with a deep-groove ball bearing on rating alone: line contact gives 238 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 238/233 kN ratings, 28.4 kN Pu and 2230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2311EA?", "a": "N2311EA is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 238 kN, C0 233 kN, Pu 28.4 kN, grease limiting speed 4,700 r/min, oil 6,700 r/min, mass about 2230 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2311EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2311EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2311ea", "＊n2311ea", "N2311EA" ], "locale_variants": {} }, { "sku": "N311", "brand": "NTN", "manufacturer_designation": "NTN N311", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 123, "static_load_kN": 111, "fatigue_load_limit_kN": 13.6, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N311 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 123 kN dynamic rating in the 55 mm bore. Numbering ties N311 to its envelope: type code N, series N300, 55 mm bore; the 120×29 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full N311 designation when purchasing. The 2.2 kN-per-mm-bore figure (123 kN over 55 mm) lets a N311 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 55 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N311.", "The N rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 120×29 mm envelope matches.", "Open N311 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "Do not replace N311 with a deep-groove ball bearing on rating alone: line contact gives 123 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 123/111 kN ratings, 13.6 kN Pu and 1420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N311?", "a": "N311 is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 123 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N311 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N311 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N311-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n311", "＊＊n311", "N311" ], "locale_variants": {} }, { "sku": "N311EA", "brand": "NTN", "manufacturer_designation": "NTN N311EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 143, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 5300, "max_rpm": 5300, "speed_oil_rpm": 7600, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies N311EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 5,300 r/min on grease and 7,600 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N311EA floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 55 mm (2.165 in) bore and 120 mm (4.724 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 29 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 55 mm shaft.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N311EA.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use N311EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 162/143 kN pair here belongs to N311EA as printed, not to the bare size.", "The 162/143 kN ratings, 17.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N311EA?", "a": "N311EA is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 143 kN, Pu 17.4 kN, grease limiting speed 5,300 r/min, oil 7,600 r/min, mass about 1430 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N311EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N311EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,300 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n311ea", "＊n311ea", "N311EA" ], "locale_variants": {} }, { "sku": "NF2311EA", "brand": "NTN", "manufacturer_designation": "NTN NF2311EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 238, "static_load_kN": 233, "fatigue_load_limit_kN": 28.4, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6700, "weight_g": 2230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2311EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 238 kN dynamic rating in the 55 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). With C 238 kN and C0 233 kN (C0/C ≈ 0.98) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 55 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF2311EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Grease limiting speed 4,700 r/min and oil 6,700 r/min are different limits for NF2311EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2311EA skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "The 238/233 kN ratings, 28.4 kN Pu and 2230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2311EA?", "a": "NF2311EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 238 kN, C0 233 kN, Pu 28.4 kN, grease limiting speed 4,700 r/min, oil 6,700 r/min, mass about 2230 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2311EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2311EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2311ea", "＊nf2311ea", "NF2311EA" ], "locale_variants": {} }, { "sku": "NF311", "brand": "NTN", "manufacturer_designation": "NTN NF311", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 123, "static_load_kN": 111, "fatigue_load_limit_kN": 13.6, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF311 on the 55×120 mm envelope, 29 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,900 r/min. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF311 floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 70.5 mm and Ew 104.5 mm — the envelope inside the 55/120 mm bore/OD where the rollers actually run. Speed ratio check: limiting 5,900 r/min is .84 of the 7,000 r/min oil value for NF311; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF311.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF311 skids at 5,900 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The NF rib arrangement is not interchangeable with another prefix on the same 55 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 120×29 mm envelope matches.", "The 123/111 kN ratings, 13.6 kN Pu and 1420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF311?", "a": "NF311 is an NTN NF single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 123 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF311 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF311 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf311", "＊＊nf311", "NF311" ], "locale_variants": {} }, { "sku": "NF311EA", "brand": "NTN", "manufacturer_designation": "NTN NF311EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 143, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 5300, "max_rpm": 5300, "speed_oil_rpm": 7600, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF311EA is the standard section of the NTN NF300 dimension series for a 55 mm shaft — 162 kN of basic dynamic capacity in a 1430 g, open bearing. Numbering ties NF311EA to its envelope: type code NF, series NF300, 55 mm bore; the 120×29 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NF311EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 5,300 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 7,600 r/min for continuously high-duty 55 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF311EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF311EA.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "If the shaft must be located both ways, do not use NF311EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NF311EA with a deep-groove ball bearing on rating alone: line contact gives 162 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 162/143 kN ratings, 17.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF311EA?", "a": "NF311EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 143 kN, Pu 17.4 kN, grease limiting speed 5,300 r/min, oil 7,600 r/min, mass about 1430 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF311EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF311EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,300 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf311ea", "＊nf311ea", "NF311EA" ], "locale_variants": {} }, { "sku": "NJ2311", "brand": "NTN", "manufacturer_designation": "NTN NJ2311", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 164, "static_load_kN": 162, "fatigue_load_limit_kN": 19.8, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 6100, "weight_g": 2130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2311 denotes a 55×120×43 mm (2.165 × 4.724 × 1.693 in) cylindrical roller bearing in the NJ2300 family, a pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ2311 designation when purchasing. Mass 2130 g for the 55×120×43 mm NJ2311 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2311 non-locating position preloads the bearing when the shaft grows.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2311.", "If the shaft must be located both ways, do not use NJ2311 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 32.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "The NJ rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 120×43 mm envelope matches.", "The 43 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 164/162 kN ratings, 19.8 kN Pu and 2130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2311?", "a": "NJ2311 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 164 kN, C0 162 kN, Pu 19.8 kN, grease limiting speed 5,200 r/min, oil 6,100 r/min, mass about 2130 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2311 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2311 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2311-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2311", "＊＊nj2311", "NJ2311" ], "locale_variants": {} }, { "sku": "NJ2311EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2311EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 238, "static_load_kN": 233, "fatigue_load_limit_kN": 28.4, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6700, "weight_g": 2230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2311EA appears as a 55 mm bore single-row cylindrical roller bearing (238 kN C / 233 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 120 mm OD and 43 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 4,700 r/min grease and 6,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. Mass 2230 g for the 55×120×43 mm NJ2311EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ2311EA.", "Grease limiting speed 4,700 r/min and oil 6,700 r/min are different limits for NJ2311EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NJ2311EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2311EA skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NJ2311EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 238/233 kN ratings, 28.4 kN Pu and 2230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2311EA?", "a": "NJ2311EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 238 kN, C0 233 kN, Pu 28.4 kN, grease limiting speed 4,700 r/min, oil 6,700 r/min, mass about 2230 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2311EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2311EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2311ea", "＊nj2311ea", "NJ2311EA" ], "locale_variants": {} }, { "sku": "NJ311", "brand": "NTN", "manufacturer_designation": "NTN NJ311", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 123, "static_load_kN": 111, "fatigue_load_limit_kN": 13.6, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ311 appears as a 55 mm bore single-row cylindrical roller bearing (123 kN C / 111 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 70.5 mm and Ew 104.5 mm — the envelope inside the 55/120 mm bore/OD where the rollers actually run. Equivalent-load planning treats NJ311 as a pure radial bearing: keep P below 123 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 55 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ311.", "The 32.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 29 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 123/111 kN pair here belongs to NJ311 as printed, not to the bare size.", "Open NJ311 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The NJ rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 120×29 mm envelope matches.", "The 123/111 kN ratings, 13.6 kN Pu and 1420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ311?", "a": "NJ311 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 123 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ311 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ311 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ311-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj311", "＊＊nj311", "NJ311" ], "locale_variants": {} }, { "sku": "NJ311EA", "brand": "NTN", "manufacturer_designation": "NTN NJ311EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 143, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 5300, "max_rpm": 5300, "speed_oil_rpm": 7600, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ311EA appears as a 55 mm bore single-row cylindrical roller bearing (162 kN C / 143 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ311EA to its envelope: type code NJ, series NJ300, 55 mm bore; the 120×29 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 32.5 mm radial section ((120−55)/2) frames the roller complement; capacity per millimetre of bore is about 2.9 kN/mm before application factors. The 55 mm (2.165 in) bore and 120 mm (4.724 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 29 mm-wide ring. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ311EA.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Grease limiting speed 5,300 r/min and oil 7,600 r/min are different limits for NJ311EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 32.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 29 mm-wide cavity.", "The 162/143 kN ratings, 17.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ311EA?", "a": "NJ311EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 143 kN, Pu 17.4 kN, grease limiting speed 5,300 r/min, oil 7,600 r/min, mass about 1430 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ311EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ311EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,300 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj311ea", "＊nj311ea", "NJ311EA" ], "locale_variants": {} }, { "sku": "NU2311-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2311", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 164, "static_load_kN": 162, "fatigue_load_limit_kN": 19.8, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 6100, "weight_g": 2130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2311 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 164 kN dynamic rating in the 55 mm bore. Digit by digit, NU2311 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NU2311 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NU2311 as a pure radial bearing: keep P below 164 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2311 non-locating position preloads the bearing when the shaft grows.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2311.", "The 43 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "If the shaft must be located both ways, do not use NU2311 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU2311 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 164/162 kN ratings, 19.8 kN Pu and 2130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2311?", "a": "NU2311 is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 164 kN, C0 162 kN, Pu 19.8 kN, grease limiting speed 5,200 r/min, oil 6,100 r/min, mass about 2130 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2311 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2311 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2311", "＊＊nu2311", "NU2311", "NU2311-NTN" ], "locale_variants": {} }, { "sku": "NU2311EA", "brand": "NTN", "manufacturer_designation": "NTN NU2311EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 238, "static_load_kN": 233, "fatigue_load_limit_kN": 28.4, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6700, "weight_g": 2230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NU2311EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,700 r/min on grease and 6,700 r/min on oil. Digit by digit, NU2311EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 70.5 mm and Ew 106.5 mm — the envelope inside the 55/120 mm bore/OD where the rollers actually run. Speed ratio check: limiting 4,700 r/min is .70 of the 6,700 r/min oil value for NU2311EA; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NU2311EA; an oversized radius locks the ring on its face and tilts the 43 mm-wide seat.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU2311EA.", "The 32.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "Open NU2311EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The NU rib arrangement is not interchangeable with another prefix on the same 55 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 120×43 mm envelope matches.", "The NU rib arrangement is not interchangeable with another prefix on the same 55 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 120×43 mm envelope matches.", "The 238/233 kN ratings, 28.4 kN Pu and 2230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2311EA?", "a": "NU2311EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 238 kN, C0 233 kN, Pu 28.4 kN, grease limiting speed 4,700 r/min, oil 6,700 r/min, mass about 2230 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2311EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2311EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2311ea", "＊nu2311ea", "NU2311EA" ], "locale_variants": {} }, { "sku": "NU311-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU311", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 123, "static_load_kN": 111, "fatigue_load_limit_kN": 13.6, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU311 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 55×120×29 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 120 mm OD and 29 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU311 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NU311 as a pure radial bearing: keep P below 123 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU311.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NU311 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Do not replace NU311 with a deep-groove ball bearing on rating alone: line contact gives 123 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 123/111 kN ratings, 13.6 kN Pu and 1420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU311?", "a": "NU311 is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 123 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU311 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU311 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu311", "＊＊nu311", "NU311", "NU311-NTN" ], "locale_variants": {} }, { "sku": "NU311EA", "brand": "NTN", "manufacturer_designation": "NTN NU311EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 143, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 5300, "max_rpm": 5300, "speed_oil_rpm": 7600, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU311EA is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 55×120×29 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU311EA floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU311EA. Rating life at 162 kN C assumes clean oil and adequate film; the 17.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU311EA.", "If the shaft must be located both ways, do not use NU311EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NU311EA with a deep-groove ball bearing on rating alone: line contact gives 162 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NU311EA with a deep-groove ball bearing on rating alone: line contact gives 162 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The 162/143 kN ratings, 17.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU311EA?", "a": "NU311EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 143 kN, Pu 17.4 kN, grease limiting speed 5,300 r/min, oil 7,600 r/min, mass about 1430 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU311EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU311EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,300 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu311ea", "＊nu311ea", "NU311EA" ], "locale_variants": {} }, { "sku": "NUP2311", "brand": "NTN", "manufacturer_designation": "NTN NUP2311", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 164, "static_load_kN": 162, "fatigue_load_limit_kN": 19.8, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 6100, "weight_g": 2130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2311 is the extra-wide (23) section of the NTN NUP2300 dimension series for a 55 mm shaft — 164 kN of basic dynamic capacity in a 2130 g, open bearing. Numbering ties NUP2311 to its envelope: type code NUP, series NUP2300, 55 mm bore; the 120×43 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 164 kN and C0 162 kN (C0/C ≈ 0.99) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 164 kN C assumes clean oil and adequate film; the 19.8 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NUP2311; an oversized radius locks the ring on its face and tilts the 43 mm-wide seat.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2311.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2311 skids at 5,200 r/min and fails by smearing long before L10 fatigue.", "The 164/162 kN ratings, 19.8 kN Pu and 2130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2311?", "a": "NUP2311 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 164 kN, C0 162 kN, Pu 19.8 kN, grease limiting speed 5,200 r/min, oil 6,100 r/min, mass about 2130 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2311 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2311 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2311-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2311", "＊＊nup2311", "NUP2311" ], "locale_variants": {} }, { "sku": "NUP2311EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2311EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 238, "static_load_kN": 233, "fatigue_load_limit_kN": 28.4, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6700, "weight_g": 2230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2311EA denotes a 55×120×43 mm (2.165 × 4.724 × 1.693 in) cylindrical roller bearing in the NUP2300 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2311EA floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 4,700 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 6,700 r/min for continuously high-duty 55 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2311EA.", "Open NUP2311EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "Do not replace NUP2311EA with a deep-groove ball bearing on rating alone: line contact gives 238 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 32.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 238/233 kN pair here belongs to NUP2311EA as printed, not to the bare size.", "The 238/233 kN ratings, 28.4 kN Pu and 2230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2311EA?", "a": "NUP2311EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 238 kN, C0 233 kN, Pu 28.4 kN, grease limiting speed 4,700 r/min, oil 6,700 r/min, mass about 2230 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2311EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2311EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2311ea", "＊nup2311ea", "NUP2311EA" ], "locale_variants": {} }, { "sku": "NUP311", "brand": "NTN", "manufacturer_designation": "NTN NUP311", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 123, "static_load_kN": 111, "fatigue_load_limit_kN": 13.6, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NUP311: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,900 r/min on grease and 7,000 r/min on oil. Digit by digit, NUP311 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP311. Rating life at 123 kN C assumes clean oil and adequate film; the 13.6 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP311 non-locating position preloads the bearing when the shaft grows.", "applications": [ "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives", "fan and blower rotor positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP311.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Open NUP311 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 55 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The 123/111 kN ratings, 13.6 kN Pu and 1420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP311 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP311?", "a": "NUP311 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 123 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP311 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP311 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP311 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP311?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 104.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP311-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup311", "＊＊nup311", "NUP311" ], "locale_variants": {} }, { "sku": "NUP311EA", "brand": "NTN", "manufacturer_designation": "NTN NUP311EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 162, "static_load_kN": 143, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 5300, "max_rpm": 5300, "speed_oil_rpm": 7600, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP311EA denotes a 55×120×29 mm (2.165 × 4.724 × 1.142 in) cylindrical roller bearing in the NUP300 family, the EA high-capacity pressed sheet-steel cage. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). The 32.5 mm radial section ((120−55)/2) frames the roller complement; capacity per millimetre of bore is about 2.9 kN/mm before application factors. Mass 1430 g for the 55×120×29 mm NUP311EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP311EA.", "The NUP rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 120×29 mm envelope matches.", "Grease limiting speed 5,300 r/min and oil 7,600 r/min are different limits for NUP311EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 55 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 32.5 mm section at 55 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 29 mm-wide cavity.", "The 162/143 kN ratings, 17.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP311EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP311EA?", "a": "NUP311EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 143 kN, Pu 17.4 kN, grease limiting speed 5,300 r/min, oil 7,600 r/min, mass about 1430 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP311EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP311EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP311EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 70.5 mm, Ew 106.5 mm. The nominal bore/OD remain 55/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,300 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP311EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup311ea", "＊nup311ea", "NUP311EA" ], "locale_variants": {} }, { "sku": "N411", "brand": "NTN", "manufacturer_designation": "NTN N411", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 138, "fatigue_load_limit_kN": 16.9, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N411 appears as a 55 mm bore single-row cylindrical roller bearing (154 kN C / 138 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate N states which ring carries the ribs, which determines whether N411 floats or locates; the numeric remainder is the ISO 15 series and 55 mm bore reference, not a fit or clearance instruction. At 5,000 r/min with oil versus 4,300 r/min with grease (a 700 r/min band), lubrication choice for N411 is a thermal decision, not just a sealing one. The 55 mm (2.165 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 33 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 55 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts", "papermaking and printing auxiliary drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting N411.", "The 42.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N411 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 154/138 kN pair here belongs to N411 as printed, not to the bare size.", "Grease limiting speed 4,300 r/min and oil 5,000 r/min are different limits for N411: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 154/138 kN ratings, 16.9 kN Pu and 2420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N411 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N411?", "a": "N411 is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 140 mm OD and 33 mm width (2.165 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 138 kN, Pu 16.9 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N411 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N411 is supplied in the standard open execution shown in the table." }, { "q": "Can N411 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N411?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77.2 mm, Ew 117.2 mm. The nominal bore/OD remain 55/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N411", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n411", "N411" ], "locale_variants": {} }, { "sku": "NF411", "brand": "NTN", "manufacturer_designation": "NTN NF411", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 138, "fatigue_load_limit_kN": 16.9, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 55 mm shaft NTN supplies NF411: one integral rib on each ring; the open execution is rated 4,300 r/min on grease and 5,000 r/min on oil. Digit by digit, NF411 reads as NF (one rib on each ring), ISO 15 series, and bore 55 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 42.5 mm radial section ((140−55)/2) frames the roller complement; capacity per millimetre of bore is about 2.8 kN/mm before application factors. Thermal planning around the 4,300 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,000 r/min for continuously high-duty 55 mm positions. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "papermaking and printing auxiliary drives", "fan and blower rotor positions", "industrial gearbox input and output shafts", "medium electric-motor and generator shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NF411.", "Grease limiting speed 4,300 r/min and oil 5,000 r/min are different limits for NF411: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NF411 with a deep-groove ball bearing on rating alone: line contact gives 154 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NF411 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The 42.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The 154/138 kN ratings, 16.9 kN Pu and 2420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF411 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF411?", "a": "NF411 is an NTN NF single-row cylindrical roller bearing to ISO 15: 55 mm bore, 140 mm OD and 33 mm width (2.165 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 138 kN, Pu 16.9 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF411 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF411 is supplied in the standard open execution shown in the table." }, { "q": "Can NF411 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF411?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77.2 mm, Ew 117.2 mm. The nominal bore/OD remain 55/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF411", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf411", "NF411" ], "locale_variants": {} }, { "sku": "NJ411-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ411", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 138, "fatigue_load_limit_kN": 16.9, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ411 on the 55×140 mm envelope, 33 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,300 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 55 mm, with 140 mm OD and 33 mm width from the ISO 15 general plan. At 5,000 r/min with oil versus 4,300 r/min with grease (a 700 r/min band), lubrication choice for NJ411 is a thermal decision, not just a sealing one. Speed ratio check: limiting 4,300 r/min is .86 of the 5,000 r/min oil value for NJ411; grease-churn heating closes that gap as fill quantity rises. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NJ411.", "Do not replace NJ411 with a deep-groove ball bearing on rating alone: line contact gives 154 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NJ411 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "The 42.5 mm section at 55 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Grease limiting speed 4,300 r/min and oil 5,000 r/min are different limits for NJ411: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 154/138 kN ratings, 16.9 kN Pu and 2420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ411 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ411?", "a": "NJ411 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 55 mm bore, 140 mm OD and 33 mm width (2.165 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 138 kN, Pu 16.9 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ411 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ411 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ411 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ411?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77.2 mm, Ew 117.2 mm. The nominal bore/OD remain 55/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ411", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj411", "NJ411", "NJ411-NTN" ], "locale_variants": {} }, { "sku": "NU411-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU411", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 138, "fatigue_load_limit_kN": 16.9, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU411 appears as a 55 mm bore single-row cylindrical roller bearing (154 kN C / 138 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 55 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 4,300 r/min grease and 5,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. Rating life at 154 kN C assumes clean oil and adequate film; the 16.9 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 55 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets", "material-handling drum and wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU411.", "If the shaft must be located both ways, do not use NU411 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NU rib arrangement is not interchangeable with another prefix on the same 55 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "Open NU411 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 55 mm contact.", "If the shaft must be located both ways, do not use NU411 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 154/138 kN ratings, 16.9 kN Pu and 2420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU411 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU411?", "a": "NU411 is an NTN NU single-row cylindrical roller bearing to ISO 15: 55 mm bore, 140 mm OD and 33 mm width (2.165 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 138 kN, Pu 16.9 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU411 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU411 is supplied in the standard open execution shown in the table." }, { "q": "Can NU411 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU411?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77.2 mm, Ew 117.2 mm. The nominal bore/OD remain 55/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU411", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu411", "NU411", "NU411-NTN" ], "locale_variants": {} }, { "sku": "NUP411", "brand": "NTN", "manufacturer_designation": "NTN NUP411", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 138, "fatigue_load_limit_kN": 16.9, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP411 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 154 kN dynamic rating in the 55 mm bore. Numbering ties NUP411 to its envelope: type code NUP, series NUP400, 55 mm bore; the 140×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 154 kN and C0 138 kN (C0/C ≈ 0.90) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Thermal planning around the 4,300 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,000 r/min for continuously high-duty 55 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "industrial gearbox input and output shafts", "medium electric-motor and generator shafts", "pump and compressor crankshafts and rotors", "machine-tool gearbox and spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "On this 55 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP411.", "The NUP rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP411 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP411 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP411 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "The 154/138 kN ratings, 16.9 kN Pu and 2420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP411 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP411?", "a": "NUP411 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 55 mm bore, 140 mm OD and 33 mm width (2.165 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 138 kN, Pu 16.9 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2420 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP411 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP411 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP411 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP411?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77.2 mm, Ew 117.2 mm. The nominal bore/OD remain 55/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP411", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup411", "NUP411" ], "locale_variants": {} }, { "sku": "N1012", "brand": "NTN", "manufacturer_designation": "NTN N1012", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44.5, "static_load_kN": 48.5, "fatigue_load_limit_kN": 5.95, "limiting_speed_rpm": 7500, "max_rpm": 7500, "speed_oil_rpm": 8800, "weight_g": 467, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 60 mm shaft NTN supplies N1012: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 7,500 r/min on grease and 8,800 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N1012 floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. At 8,800 r/min with oil versus 7,500 r/min with grease (a 1,300 r/min band), lubrication choice for N1012 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 5.95 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (48.5/44.5 kN) shows the high-static-capacity proportioning of this 60 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1012.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 95 mm raceway.", "The N rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 95×18 mm envelope matches.", "Do not replace N1012 with a deep-groove ball bearing on rating alone: line contact gives 44.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 7,500 r/min and oil 8,800 r/min are different limits for N1012: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 7,500 r/min and oil 8,800 r/min are different limits for N1012: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 44.5/48.5 kN ratings, 5.95 kN Pu and 467 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1012 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1012?", "a": "N1012 is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 95 mm OD and 18 mm width (2.362 × 3.74 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 44.5 kN, C0 48.5 kN, Pu 5.95 kN, grease limiting speed 7,500 r/min, oil 8,800 r/min, mass about 467 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1012 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1012 is supplied in the standard open execution shown in the table." }, { "q": "Can N1012 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1012?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 69.5 mm, Ew 85.5 mm. The nominal bore/OD remain 60/95 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,500 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1012", "N1012" ], "locale_variants": {} }, { "sku": "NJ1012", "brand": "NTN", "manufacturer_designation": "NTN NJ1012", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44.5, "static_load_kN": 48.5, "fatigue_load_limit_kN": 5.95, "limiting_speed_rpm": 7500, "max_rpm": 7500, "speed_oil_rpm": 8800, "weight_g": 467, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ1012 on the 60×95 mm envelope, 18 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 7,500 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 60 mm, with 95 mm OD and 18 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NJ1012 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 7,500 r/min is .85 of the 8,800 r/min oil value for NJ1012; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1012 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 95 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 44.5/48.5 kN pair here belongs to NJ1012 as printed, not to the bare size.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "The 17.5 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 44.5/48.5 kN ratings, 5.95 kN Pu and 467 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1012 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1012?", "a": "NJ1012 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 95 mm OD and 18 mm width (2.362 × 3.74 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 44.5 kN, C0 48.5 kN, Pu 5.95 kN, grease limiting speed 7,500 r/min, oil 8,800 r/min, mass about 467 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1012 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1012 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1012 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1012?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 69.5 mm, Ew 85.5 mm. The nominal bore/OD remain 60/95 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,500 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1012", "NJ1012" ], "locale_variants": {} }, { "sku": "NN3012", "brand": "NTN", "manufacturer_designation": "NTN NN3012", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 78.5, "static_load_kN": 102, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 6700, "max_rpm": 6700, "speed_oil_rpm": 7900, "weight_g": 704, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN3012 denotes a 60×95×26 mm (2.362 × 3.74 × 1.024 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN3012 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 7,900 r/min with oil versus 6,700 r/min with grease (a 1,200 r/min band), lubrication choice for NN3012 is a thermal decision, not just a sealing one. Rating life at 78.5 kN C assumes clean oil and adequate film; the 12.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NN3012; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.", "applications": [ "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 95 mm raceway.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NN3012 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "Grease limiting speed 6,700 r/min and oil 7,900 r/min are different limits for NN3012: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 78.5/102 kN ratings, 12.4 kN Pu and 704 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3012 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3012?", "a": "NN3012 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 60 mm bore, 95 mm OD and 26 mm width (2.362 × 3.74 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 78.5 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 6,700 r/min, oil 7,900 r/min, mass about 704 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3012 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3012 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3012?", "a": "NN3012 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3012?", "a": "NTN rates NN3012 at 6,700 r/min with grease and 7,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3012", "NN3012" ], "locale_variants": {} }, { "sku": "NN3012K", "brand": "NTN", "manufacturer_designation": "NTN NN3012K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 78.5, "static_load_kN": 102, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 6700, "max_rpm": 6700, "speed_oil_rpm": 7900, "weight_g": 683, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3012K appears as a 60 mm bore single-row cylindrical roller bearing (78.5 kN C / 102 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3012K floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 6,700 r/min grease and 7,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 60 mm bore. Rating life at 78.5 kN C assumes clean oil and adequate film; the 12.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3012K non-locating position preloads the bearing when the shaft grows.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 95 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3012K skids at 6,700 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 78.5/102 kN pair here belongs to NN3012K as printed, not to the bare size.", "The NN rib arrangement is not interchangeable with another prefix on the same 60 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 95×26 mm envelope matches.", "The K tapered bore of NN3012K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "The 78.5/102 kN ratings, 12.4 kN Pu and 683 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3012K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3012K?", "a": "NN3012K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 60 mm bore, 95 mm OD and 26 mm width (2.362 × 3.74 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 78.5 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 6,700 r/min, oil 7,900 r/min, mass about 683 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3012K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3012K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3012K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3012K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3012 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3012K?", "a": "NTN rates NN3012K at 6,700 r/min with grease and 7,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3012K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3012k", "NN3012K" ], "locale_variants": {} }, { "sku": "NU1012", "brand": "NTN", "manufacturer_designation": "NTN NU1012", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44.5, "static_load_kN": 48.5, "fatigue_load_limit_kN": 5.95, "limiting_speed_rpm": 7500, "max_rpm": 7500, "speed_oil_rpm": 8800, "weight_g": 467, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU1012 denotes a 60×95×18 mm (2.362 × 3.74 × 0.709 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. Digit by digit, NU1012 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. The 60 mm (2.362 in) bore and 95 mm (3.74 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 18 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU1012; an oversized radius locks the ring on its face and tilts the 18 mm-wide seat.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 95 mm raceway.", "Do not replace NU1012 with a deep-groove ball bearing on rating alone: line contact gives 44.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NU1012 with a deep-groove ball bearing on rating alone: line contact gives 44.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 17.5 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 18 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 44.5/48.5 kN pair here belongs to NU1012 as printed, not to the bare size.", "The 44.5/48.5 kN ratings, 5.95 kN Pu and 467 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1012 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1012?", "a": "NU1012 is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 95 mm OD and 18 mm width (2.362 × 3.74 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 44.5 kN, C0 48.5 kN, Pu 5.95 kN, grease limiting speed 7,500 r/min, oil 8,800 r/min, mass about 467 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1012 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1012 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1012 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1012?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 69.5 mm, Ew 85.5 mm. The nominal bore/OD remain 60/95 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,500 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1012-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1012", "NU1012" ], "locale_variants": {} }, { "sku": "NUP1012", "brand": "NTN", "manufacturer_designation": "NTN NUP1012", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44.5, "static_load_kN": 48.5, "fatigue_load_limit_kN": 5.95, "limiting_speed_rpm": 7500, "max_rpm": 7500, "speed_oil_rpm": 8800, "weight_g": 467, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP1012 denotes a 60×95×18 mm (2.362 × 3.74 × 0.709 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. Digit by digit, NUP1012 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 8,800 r/min with oil versus 7,500 r/min with grease (a 1,300 r/min band), lubrication choice for NUP1012 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 60 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 95 mm raceway.", "Do not replace NUP1012 with a deep-groove ball bearing on rating alone: line contact gives 44.5 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Grease limiting speed 7,500 r/min and oil 8,800 r/min are different limits for NUP1012: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 44.5/48.5 kN ratings, 5.95 kN Pu and 467 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1012 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1012?", "a": "NUP1012 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 95 mm OD and 18 mm width (2.362 × 3.74 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 44.5 kN, C0 48.5 kN, Pu 5.95 kN, grease limiting speed 7,500 r/min, oil 8,800 r/min, mass about 467 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1012 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1012 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1012 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1012?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 69.5 mm, Ew 85.5 mm. The nominal bore/OD remain 60/95 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,500 r/min grease / 8,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1012", "NUP1012" ], "locale_variants": {} }, { "sku": "N212", "brand": "NTN", "manufacturer_designation": "NTN N212", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 75, "fatigue_load_limit_kN": 9.15, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7600, "weight_g": 802, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N212 denotes a 60×110×22 mm (2.362 × 4.331 × 0.866 in) cylindrical roller bearing in the N200 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N212 floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. With C 76 kN and C0 75 kN (C0/C ≈ 0.99) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Thermal planning around the 6,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 7,600 r/min for continuously high-duty 60 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N212 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N212 skids at 6,400 r/min and fails by smearing long before L10 fatigue.", "Do not replace N212 with a deep-groove ball bearing on rating alone: line contact gives 76 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The N rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×22 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N212 skids at 6,400 r/min and fails by smearing long before L10 fatigue.", "The 76/75 kN ratings, 9.15 kN Pu and 802 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N212?", "a": "N212 is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 76 kN, C0 75 kN, Pu 9.15 kN, grease limiting speed 6,400 r/min, oil 7,600 r/min, mass about 802 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N212 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N212 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N212-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n212", "＊＊n212", "N212" ], "locale_variants": {} }, { "sku": "N212EA", "brand": "NTN", "manufacturer_designation": "NTN N212EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 107, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 8200, "weight_g": 798, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N212EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 60×110×22 mm ISO 15 envelope. On the NTN nameplate N states which ring carries the ribs, which determines whether N212EA floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 5,800 r/min grease and 8,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 60 mm bore. Selection arithmetic: Pu 13.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.93 (107/115 kN) shows the high-static-capacity proportioning of this 60 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 60 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The 22 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Do not replace N212EA with a deep-groove ball bearing on rating alone: line contact gives 115 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 115/107 kN pair here belongs to N212EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use N212EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 115/107 kN ratings, 13.1 kN Pu and 798 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N212EA?", "a": "N212EA is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 107 kN, Pu 13.1 kN, grease limiting speed 5,800 r/min, oil 8,200 r/min, mass about 798 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N212EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N212EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n212ea", "＊n212ea", "N212EA" ], "locale_variants": {} }, { "sku": "N2212", "brand": "NTN", "manufacturer_designation": "NTN N2212", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 116, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 6800, "weight_g": 1040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2212 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 107 kN dynamic rating in the 60 mm bore. Numbering ties N2212 to its envelope: type code N, series N2200, 60 mm bore; the 110×28 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2212 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 14.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.08 (116/107 kN) shows the high-static-capacity proportioning of this 60 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2212 non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 107/116 kN pair here belongs to N2212 as printed, not to the bare size.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Do not replace N2212 with a deep-groove ball bearing on rating alone: line contact gives 107 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 107/116 kN ratings, 14.1 kN Pu and 1040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2212?", "a": "N2212 is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 116 kN, Pu 14.1 kN, grease limiting speed 5,800 r/min, oil 6,800 r/min, mass about 1040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2212 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2212 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 6,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2212", "＊＊n2212", "N2212" ], "locale_variants": {} }, { "sku": "N2212EA", "brand": "NTN", "manufacturer_designation": "NTN N2212EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 155, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 60 mm shaft NTN supplies N2212EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 5,200 r/min on grease and 7,300 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 60 mm, with 110 mm OD and 28 mm width from the ISO 15 general plan. The 28 mm width and 25.0 mm section put the N2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 5,200 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 7,300 r/min for continuously high-duty 60 mm positions. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Open N2212EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "Open N2212EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2212EA skids at 5,200 r/min and fails by smearing long before L10 fatigue.", "Open N2212EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "The 155/157 kN ratings, 19.1 kN Pu and 1080 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2212EA?", "a": "N2212EA is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1080 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2212EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2212EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2212ea", "＊n2212ea", "N2212EA" ], "locale_variants": {} }, { "sku": "NF212", "brand": "NTN", "manufacturer_designation": "NTN NF212", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 75, "fatigue_load_limit_kN": 9.15, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7600, "weight_g": 802, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF212 appears as a 60 mm bore single-row cylindrical roller bearing (76 kN C / 75 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF212 reads as NF (one rib on each ring), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 802 g for the 60×110×22 mm NF212 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF212.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Grease limiting speed 6,400 r/min and oil 7,600 r/min are different limits for NF212: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 76/75 kN pair here belongs to NF212 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 76/75 kN pair here belongs to NF212 as printed, not to the bare size.", "The 76/75 kN ratings, 9.15 kN Pu and 802 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF212?", "a": "NF212 is an NTN NF single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 76 kN, C0 75 kN, Pu 9.15 kN, grease limiting speed 6,400 r/min, oil 7,600 r/min, mass about 802 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF212 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF212 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf212", "＊＊nf212", "NF212" ], "locale_variants": {} }, { "sku": "NF212EA", "brand": "NTN", "manufacturer_designation": "NTN NF212EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 107, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 8200, "weight_g": 798, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF212EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 115 kN dynamic rating in the 60 mm bore. Numbering ties NF212EA to its envelope: type code NF, series NF200, 60 mm bore; the 110×22 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 115 kN and C0 107 kN (C0/C ≈ 0.93) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. The 1.9 kN-per-mm-bore figure (115 kN over 60 mm) lets a NF212EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 60 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "The NF rib arrangement is not interchangeable with another prefix on the same 60 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 110×22 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 115/107 kN pair here belongs to NF212EA as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF212EA skids at 5,800 r/min and fails by smearing long before L10 fatigue.", "The 115/107 kN ratings, 13.1 kN Pu and 798 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF212EA?", "a": "NF212EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 107 kN, Pu 13.1 kN, grease limiting speed 5,800 r/min, oil 8,200 r/min, mass about 798 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF212EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF212EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf212ea", "＊nf212ea", "NF212EA" ], "locale_variants": {} }, { "sku": "NF2212EA", "brand": "NTN", "manufacturer_designation": "NTN NF2212EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 155, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF2212EA on the 60×110 mm envelope, 28 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,200 r/min. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). The 25.0 mm radial section ((110−60)/2) frames the roller complement; capacity per millimetre of bore is about 2.6 kN/mm before application factors. Equivalent-load planning treats NF2212EA as a pure radial bearing: keep P below 155 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 60 mm shaft.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2212EA skids at 5,200 r/min and fails by smearing long before L10 fatigue.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The 155/157 kN ratings, 19.1 kN Pu and 1080 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2212EA?", "a": "NF2212EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1080 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2212EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2212EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2212ea", "＊nf2212ea", "NF2212EA" ], "locale_variants": {} }, { "sku": "NJ212", "brand": "NTN", "manufacturer_designation": "NTN NJ212", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 75, "fatigue_load_limit_kN": 9.15, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7600, "weight_g": 802, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ212 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 60×110×22 mm ISO 15 envelope. Digit by digit, NJ212 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 76 kN and C0 75 kN (C0/C ≈ 0.99) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 6,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 7,600 r/min for continuously high-duty 60 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 76/75 kN pair here belongs to NJ212 as printed, not to the bare size.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "Open NJ212 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ212 skids at 6,400 r/min and fails by smearing long before L10 fatigue.", "The 76/75 kN ratings, 9.15 kN Pu and 802 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ212?", "a": "NJ212 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 76 kN, C0 75 kN, Pu 9.15 kN, grease limiting speed 6,400 r/min, oil 7,600 r/min, mass about 802 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ212 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ212 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ212-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj212", "＊＊nj212", "NJ212" ], "locale_variants": {} }, { "sku": "NJ212EA", "brand": "NTN", "manufacturer_designation": "NTN NJ212EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 107, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 8200, "weight_g": 798, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ212EA on the 60×110 mm envelope, 22 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,800 r/min. Numbering ties NJ212EA to its envelope: type code NJ, series NJ200, 60 mm bore; the 110×22 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 13.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.93 (107/115 kN) shows the high-static-capacity proportioning of this 60 mm bore. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The 22 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NJ212EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 115/107 kN pair here belongs to NJ212EA as printed, not to the bare size.", "The 115/107 kN ratings, 13.1 kN Pu and 798 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ212EA?", "a": "NJ212EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 107 kN, Pu 13.1 kN, grease limiting speed 5,800 r/min, oil 8,200 r/min, mass about 798 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ212EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ212EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj212ea", "＊nj212ea", "NJ212EA" ], "locale_variants": {} }, { "sku": "NJ2212", "brand": "NTN", "manufacturer_designation": "NTN NJ2212", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 116, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 6800, "weight_g": 1040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 60 mm shaft NTN supplies NJ2212: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 5,800 r/min on grease and 6,800 r/min on oil. Digit by digit, NJ2212 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 107 kN and C0 116 kN (C0/C ≈ 1.08) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Equivalent-load planning treats NJ2212 as a pure radial bearing: keep P below 107 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Do not replace NJ2212 with a deep-groove ball bearing on rating alone: line contact gives 107 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2212 skids at 5,800 r/min and fails by smearing long before L10 fatigue.", "The 107/116 kN ratings, 14.1 kN Pu and 1040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2212?", "a": "NJ2212 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 116 kN, Pu 14.1 kN, grease limiting speed 5,800 r/min, oil 6,800 r/min, mass about 1040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2212 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2212 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 6,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2212-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2212", "＊＊nj2212", "NJ2212" ], "locale_variants": {} }, { "sku": "NJ2212EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2212EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 155, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2212EA on the 60×110 mm envelope, 28 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,200 r/min. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2212EA floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ2212EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NJ2212EA as a pure radial bearing: keep P below 155 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2212EA.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 155/157 kN pair here belongs to NJ2212EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 155/157 kN ratings, 19.1 kN Pu and 1080 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2212EA?", "a": "NJ2212EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1080 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2212EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2212EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2212ea", "＊nj2212ea", "NJ2212EA" ], "locale_variants": {} }, { "sku": "NU212-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU212", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 75, "fatigue_load_limit_kN": 9.15, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7600, "weight_g": 802, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU212 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 60×110×22 mm ISO 15 envelope. Numbering ties NU212 to its envelope: type code NU, series NU200, 60 mm bore; the 110×22 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 73.5 mm and Ew 97.5 mm — the envelope inside the 60/110 mm bore/OD where the rollers actually run. The 1.3 kN-per-mm-bore figure (76 kN over 60 mm) lets a NU212 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 76/75 kN pair here belongs to NU212 as printed, not to the bare size.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 60 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×22 mm envelope matches.", "The 76/75 kN ratings, 9.15 kN Pu and 802 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU212?", "a": "NU212 is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 76 kN, C0 75 kN, Pu 9.15 kN, grease limiting speed 6,400 r/min, oil 7,600 r/min, mass about 802 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU212 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU212 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu212", "＊＊nu212", "NU212", "NU212-NTN" ], "locale_variants": {} }, { "sku": "NU212EA", "brand": "NTN", "manufacturer_designation": "NTN NU212EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 107, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 8200, "weight_g": 798, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU212EA is the standard section of the NTN NU200 dimension series for a 60 mm shaft — 115 kN of basic dynamic capacity in a 798 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). The 25.0 mm radial section ((110−60)/2) frames the roller complement; capacity per millimetre of bore is about 1.9 kN/mm before application factors. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU212EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "The 22 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Grease limiting speed 5,800 r/min and oil 8,200 r/min are different limits for NU212EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "The 115/107 kN ratings, 13.1 kN Pu and 798 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU212EA?", "a": "NU212EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 107 kN, Pu 13.1 kN, grease limiting speed 5,800 r/min, oil 8,200 r/min, mass about 798 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU212EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU212EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu212ea", "＊nu212ea", "NU212EA" ], "locale_variants": {} }, { "sku": "NU2212-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2212", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 116, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 6800, "weight_g": 1040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2212 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 107 kN dynamic rating in the 60 mm bore. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU2212 designation when purchasing. The 1.8 kN-per-mm-bore figure (107 kN over 60 mm) lets a NU2212 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2212 non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Grease limiting speed 5,800 r/min and oil 6,800 r/min are different limits for NU2212: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 60 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 110×28 mm envelope matches.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "The 107/116 kN ratings, 14.1 kN Pu and 1040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2212?", "a": "NU2212 is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 116 kN, Pu 14.1 kN, grease limiting speed 5,800 r/min, oil 6,800 r/min, mass about 1040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2212 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2212 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 6,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2212", "＊＊nu2212", "NU2212", "NU2212-NTN" ], "locale_variants": {} }, { "sku": "NU2212EA", "brand": "NTN", "manufacturer_designation": "NTN NU2212EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 155, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2212EA denotes a 60×110×28 mm (2.362 × 4.331 × 1.102 in) cylindrical roller bearing in the NU2200 family, the EA high-capacity pressed sheet-steel cage. Digit by digit, NU2212EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 5,200 r/min grease and 7,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 60 mm bore. The 60 mm (2.362 in) bore and 110 mm (4.331 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 28 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 60 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The 25.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "Grease limiting speed 5,200 r/min and oil 7,300 r/min are different limits for NU2212EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 5,200 r/min and oil 7,300 r/min are different limits for NU2212EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NU2212EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 155/157 kN ratings, 19.1 kN Pu and 1080 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2212EA?", "a": "NU2212EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1080 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2212EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2212EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2212ea", "＊nu2212ea", "NU2212EA" ], "locale_variants": {} }, { "sku": "NUP212", "brand": "NTN", "manufacturer_designation": "NTN NUP212", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 75, "fatigue_load_limit_kN": 9.15, "limiting_speed_rpm": 6400, "max_rpm": 6400, "speed_oil_rpm": 7600, "weight_g": 802, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP212 appears as a 60 mm bore single-row cylindrical roller bearing (76 kN C / 75 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP212 to its envelope: type code NUP, series NUP200, 60 mm bore; the 110×22 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NUP212 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 802 g for the 60×110×22 mm NUP212 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 60 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "If the shaft must be located both ways, do not use NUP212 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP212 skids at 6,400 r/min and fails by smearing long before L10 fatigue.", "The 22 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 76/75 kN ratings, 9.15 kN Pu and 802 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP212?", "a": "NUP212 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 76 kN, C0 75 kN, Pu 9.15 kN, grease limiting speed 6,400 r/min, oil 7,600 r/min, mass about 802 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP212 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP212 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP212-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup212", "＊＊nup212", "NUP212" ], "locale_variants": {} }, { "sku": "NUP212EA", "brand": "NTN", "manufacturer_designation": "NTN NUP212EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 107, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 8200, "weight_g": 798, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP212EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 115 kN dynamic rating in the 60 mm bore. Digit by digit, NUP212EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 115 kN and C0 107 kN (C0/C ≈ 0.93) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Equivalent-load planning treats NUP212EA as a pure radial bearing: keep P below 115 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP212EA.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Grease limiting speed 5,800 r/min and oil 8,200 r/min are different limits for NUP212EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 22 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Do not replace NUP212EA with a deep-groove ball bearing on rating alone: line contact gives 115 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP212EA skids at 5,800 r/min and fails by smearing long before L10 fatigue.", "The 115/107 kN ratings, 13.1 kN Pu and 798 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP212EA?", "a": "NUP212EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 22 mm width (2.362 × 4.331 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 115 kN, C0 107 kN, Pu 13.1 kN, grease limiting speed 5,800 r/min, oil 8,200 r/min, mass about 798 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP212EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP212EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup212ea", "＊nup212ea", "NUP212EA" ], "locale_variants": {} }, { "sku": "NUP2212", "brand": "NTN", "manufacturer_designation": "NTN NUP2212", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 116, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 6800, "weight_g": 1040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2212 on the 60×110 mm envelope, 28 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,800 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 60 mm, with 110 mm OD and 28 mm width from the ISO 15 general plan. At 6,800 r/min with oil versus 5,800 r/min with grease (a 1,000 r/min band), lubrication choice for NUP2212 is a thermal decision, not just a sealing one. Mass 1040 g for the 60×110×28 mm NUP2212 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "The NUP rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 110×28 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 5,800 r/min and oil 6,800 r/min are different limits for NUP2212: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 107/116 kN ratings, 14.1 kN Pu and 1040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2212 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2212?", "a": "NUP2212 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 116 kN, Pu 14.1 kN, grease limiting speed 5,800 r/min, oil 6,800 r/min, mass about 1040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2212 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2212 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2212 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2212?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 73.5 mm, Ew 97.5 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,800 r/min grease / 6,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2212-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2212", "＊＊nup2212", "NUP2212" ], "locale_variants": {} }, { "sku": "NUP2212EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2212EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 155, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 5200, "max_rpm": 5200, "speed_oil_rpm": 7300, "weight_g": 1080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2212EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 155 kN dynamic rating in the 60 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). At 7,300 r/min with oil versus 5,200 r/min with grease (a 2,100 r/min band), lubrication choice for NUP2212EA is a thermal decision, not just a sealing one. Speed ratio check: limiting 5,200 r/min is .71 of the 7,300 r/min oil value for NUP2212EA; grease-churn heating closes that gap as fill quantity rises. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "If the shaft must be located both ways, do not use NUP2212EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 155/157 kN pair here belongs to NUP2212EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Grease limiting speed 5,200 r/min and oil 7,300 r/min are different limits for NUP2212EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 155/157 kN ratings, 19.1 kN Pu and 1080 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2212EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2212EA?", "a": "NUP2212EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 5,200 r/min, oil 7,300 r/min, mass about 1080 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2212EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2212EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2212EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 72 mm, Ew 100 mm. The nominal bore/OD remain 60/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,200 r/min grease / 7,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2212EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=148", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2212ea", "＊nup2212ea", "NUP2212EA" ], "locale_variants": {} }, { "sku": "N2312", "brand": "NTN", "manufacturer_designation": "NTN N2312", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 187, "static_load_kN": 188, "fatigue_load_limit_kN": 22.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 2660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2312 appears as a 60 mm bore single-row cylindrical roller bearing (187 kN C / 188 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 60 mm, with 130 mm OD and 46 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 77 mm and Ew 113 mm — the envelope inside the 60/130 mm bore/OD where the rollers actually run. The 3.1 kN-per-mm-bore figure (187 kN over 60 mm) lets a N2312 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2312 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Open N2312 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The N rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×46 mm envelope matches.", "The 187/188 kN ratings, 22.9 kN Pu and 2660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2312?", "a": "N2312 is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 188 kN, Pu 22.9 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 2660 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2312 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2312 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2312", "＊＊n2312", "N2312" ], "locale_variants": {} }, { "sku": "N2312EA", "brand": "NTN", "manufacturer_designation": "NTN N2312EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 263, "static_load_kN": 262, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6200, "weight_g": 2730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2312EA denotes a 60×130×46 mm (2.362 × 5.118 × 1.811 in) cylindrical roller bearing in the N2300 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N2312EA floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 77 mm and Ew 115 mm — the envelope inside the 60/130 mm bore/OD where the rollers actually run. Rating life at 263 kN C assumes clean oil and adequate film; the 32 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "If the shaft must be located both ways, do not use N2312EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 4,400 r/min and oil 6,200 r/min are different limits for N2312EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The N rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×46 mm envelope matches.", "The 263/262 kN ratings, 32 kN Pu and 2730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2312EA?", "a": "N2312EA is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 262 kN, Pu 32 kN, grease limiting speed 4,400 r/min, oil 6,200 r/min, mass about 2730 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2312EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2312EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2312ea", "＊n2312ea", "N2312EA" ], "locale_variants": {} }, { "sku": "N312", "brand": "NTN", "manufacturer_designation": "NTN N312", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 137, "static_load_kN": 126, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N312 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 60×130×31 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 15.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.92 (126/137 kN) shows the high-static-capacity proportioning of this 60 mm bore. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 137/126 kN pair here belongs to N312 as printed, not to the bare size.", "Grease limiting speed 5,500 r/min and oil 6,500 r/min are different limits for N312: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 137/126 kN pair here belongs to N312 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 137/126 kN pair here belongs to N312 as printed, not to the bare size.", "The 137/126 kN ratings, 15.4 kN Pu and 1760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N312?", "a": "N312 is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 137 kN, C0 126 kN, Pu 15.4 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1760 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N312 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N312 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N312-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n312", "＊＊n312", "N312" ], "locale_variants": {} }, { "sku": "N312EA", "brand": "NTN", "manufacturer_designation": "NTN N312EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 177, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 4900, "max_rpm": 4900, "speed_oil_rpm": 7000, "weight_g": 1770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N312EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 177 kN dynamic rating in the 60 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N312EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 4,900 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 7,000 r/min for continuously high-duty 60 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 60 mm shaft.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The N rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×31 mm envelope matches.", "The N rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×31 mm envelope matches.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Do not replace N312EA with a deep-groove ball bearing on rating alone: line contact gives 177 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 177/157 kN ratings, 19.1 kN Pu and 1770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N312EA?", "a": "N312EA is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 177 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 4,900 r/min, oil 7,000 r/min, mass about 1770 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N312EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N312EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n312ea", "＊n312ea", "N312EA" ], "locale_variants": {} }, { "sku": "NF2312EA", "brand": "NTN", "manufacturer_designation": "NTN NF2312EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 263, "static_load_kN": 262, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6200, "weight_g": 2730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF2312EA appears as a 60 mm bore single-row cylindrical roller bearing (263 kN C / 262 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF2312EA reads as NF (one rib on each ring), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 4,400 r/min is .71 of the 6,200 r/min oil value for NF2312EA; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF2312EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2312EA skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NF2312EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 4,400 r/min and oil 6,200 r/min are different limits for NF2312EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/262 kN pair here belongs to NF2312EA as printed, not to the bare size.", "The 263/262 kN ratings, 32 kN Pu and 2730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2312EA?", "a": "NF2312EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 262 kN, Pu 32 kN, grease limiting speed 4,400 r/min, oil 6,200 r/min, mass about 2730 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2312EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2312EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2312ea", "＊nf2312ea", "NF2312EA" ], "locale_variants": {} }, { "sku": "NF312", "brand": "NTN", "manufacturer_designation": "NTN NF312", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 137, "static_load_kN": 126, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF312 is the standard section of the NTN NF300 dimension series for a 60 mm shaft — 137 kN of basic dynamic capacity in a 1760 g, open bearing. Numbering ties NF312 to its envelope: type code NF, series NF300, 60 mm bore; the 130×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NF312 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 2.3 kN-per-mm-bore figure (137 kN over 60 mm) lets a NF312 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 60 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF312 skids at 5,500 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NF312 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NF312 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 137/126 kN ratings, 15.4 kN Pu and 1760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF312?", "a": "NF312 is an NTN NF single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 137 kN, C0 126 kN, Pu 15.4 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1760 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF312 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF312 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf312", "＊＊nf312", "NF312" ], "locale_variants": {} }, { "sku": "NF312EA", "brand": "NTN", "manufacturer_designation": "NTN NF312EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 177, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 4900, "max_rpm": 4900, "speed_oil_rpm": 7000, "weight_g": 1770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF312EA denotes a 60×130×31 mm (2.362 × 5.118 × 1.22 in) cylindrical roller bearing in the NF300 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF312EA floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 77 mm and Ew 115 mm — the envelope inside the 60/130 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF312EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 177/157 kN pair here belongs to NF312EA as printed, not to the bare size.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "The NF rib arrangement is not interchangeable with another prefix on the same 60 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 130×31 mm envelope matches.", "The 177/157 kN ratings, 19.1 kN Pu and 1770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF312EA?", "a": "NF312EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 177 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 4,900 r/min, oil 7,000 r/min, mass about 1770 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF312EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF312EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf312ea", "＊nf312ea", "NF312EA" ], "locale_variants": {} }, { "sku": "NJ2312", "brand": "NTN", "manufacturer_designation": "NTN NJ2312", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 187, "static_load_kN": 188, "fatigue_load_limit_kN": 22.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 2660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2312 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 187 kN dynamic rating in the 60 mm bore. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 60 mm, with 130 mm OD and 46 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 4,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,700 r/min for continuously high-duty 60 mm positions. Housing and shaft fillets must clear the ring chamfers of NJ2312; an oversized radius locks the ring on its face and tilts the 46 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The NJ rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 130×46 mm envelope matches.", "The NJ rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 130×46 mm envelope matches.", "Do not replace NJ2312 with a deep-groove ball bearing on rating alone: line contact gives 187 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 187/188 kN pair here belongs to NJ2312 as printed, not to the bare size.", "The 187/188 kN ratings, 22.9 kN Pu and 2660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2312?", "a": "NJ2312 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 188 kN, Pu 22.9 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 2660 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2312 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2312 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2312-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2312", "＊＊nj2312", "NJ2312" ], "locale_variants": {} }, { "sku": "NJ2312EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2312EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 263, "static_load_kN": 262, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6200, "weight_g": 2730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2312EA is the extra-wide (23) section of the NTN NJ2300 dimension series for a 60 mm shaft — 263 kN of basic dynamic capacity in a 2730 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2312EA. Speed ratio check: limiting 4,400 r/min is .71 of the 6,200 r/min oil value for NJ2312EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2312EA.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Open NJ2312EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/262 kN pair here belongs to NJ2312EA as printed, not to the bare size.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The 263/262 kN ratings, 32 kN Pu and 2730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2312EA?", "a": "NJ2312EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 262 kN, Pu 32 kN, grease limiting speed 4,400 r/min, oil 6,200 r/min, mass about 2730 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2312EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2312EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2312ea", "＊nj2312ea", "NJ2312EA" ], "locale_variants": {} }, { "sku": "NJ312", "brand": "NTN", "manufacturer_designation": "NTN NJ312", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 137, "static_load_kN": 126, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ312 on the 60×130 mm envelope, 31 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,500 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 60 mm, with 130 mm OD and 31 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NJ312 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Do not replace NJ312 with a deep-groove ball bearing on rating alone: line contact gives 137 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Grease limiting speed 5,500 r/min and oil 6,500 r/min are different limits for NJ312: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 137/126 kN ratings, 15.4 kN Pu and 1760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ312?", "a": "NJ312 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 137 kN, C0 126 kN, Pu 15.4 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1760 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ312 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ312 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ312-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj312", "＊＊nj312", "NJ312" ], "locale_variants": {} }, { "sku": "NJ312EA", "brand": "NTN", "manufacturer_designation": "NTN NJ312EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 177, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 4900, "max_rpm": 4900, "speed_oil_rpm": 7000, "weight_g": 1770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ312EA is the standard section of the NTN NJ300 dimension series for a 60 mm shaft — 177 kN of basic dynamic capacity in a 1770 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ312EA floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. The 31 mm width and 35.0 mm section put the NJ300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 19.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.89 (157/177 kN) shows the high-static-capacity proportioning of this 60 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ312EA.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Grease limiting speed 4,900 r/min and oil 7,000 r/min are different limits for NJ312EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NJ312EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "The 177/157 kN ratings, 19.1 kN Pu and 1770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ312EA?", "a": "NJ312EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 177 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 4,900 r/min, oil 7,000 r/min, mass about 1770 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ312EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ312EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj312ea", "＊nj312ea", "NJ312EA" ], "locale_variants": {} }, { "sku": "NU2312-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU2312", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 187, "static_load_kN": 188, "fatigue_load_limit_kN": 22.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 2660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2312 denotes a 60×130×46 mm (2.362 × 5.118 × 1.811 in) cylindrical roller bearing in the NU2300 family, a pressed sheet-steel cage. Numbering ties NU2312 to its envelope: type code NU, series NU2300, 60 mm bore; the 130×46 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 35.0 mm radial section ((130−60)/2) frames the roller complement; capacity per millimetre of bore is about 3.1 kN/mm before application factors. Speed ratio check: limiting 4,800 r/min is .84 of the 5,700 r/min oil value for NU2312; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 60 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×46 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2312 skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "Do not replace NU2312 with a deep-groove ball bearing on rating alone: line contact gives 187 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.", "The 187/188 kN ratings, 22.9 kN Pu and 2660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2312?", "a": "NU2312 is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 188 kN, Pu 22.9 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 2660 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2312 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2312 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2312", "＊＊nu2312", "NU2312", "NU2312-NTN" ], "locale_variants": {} }, { "sku": "NU2312EA", "brand": "NTN", "manufacturer_designation": "NTN NU2312EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 263, "static_load_kN": 262, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6200, "weight_g": 2730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2312EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 263 kN dynamic rating in the 60 mm bore. Numbering ties NU2312EA to its envelope: type code NU, series NU2300, 60 mm bore; the 130×46 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 6,200 r/min with oil versus 4,400 r/min with grease (a 1,800 r/min band), lubrication choice for NU2312EA is a thermal decision, not just a sealing one. Equivalent-load planning treats NU2312EA as a pure radial bearing: keep P below 263 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 60 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Open NU2312EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2312EA skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/262 kN pair here belongs to NU2312EA as printed, not to the bare size.", "Grease limiting speed 4,400 r/min and oil 6,200 r/min are different limits for NU2312EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 263/262 kN ratings, 32 kN Pu and 2730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2312EA?", "a": "NU2312EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 262 kN, Pu 32 kN, grease limiting speed 4,400 r/min, oil 6,200 r/min, mass about 2730 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2312EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2312EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2312ea", "＊nu2312ea", "NU2312EA" ], "locale_variants": {} }, { "sku": "NU312-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU312", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 137, "static_load_kN": 126, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU312 appears as a 60 mm bore single-row cylindrical roller bearing (137 kN C / 126 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU312 floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. With C 137 kN and C0 126 kN (C0/C ≈ 0.92) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 5,500 r/min is .85 of the 6,500 r/min oil value for NU312; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU312 skids at 5,500 r/min and fails by smearing long before L10 fatigue.", "Do not replace NU312 with a deep-groove ball bearing on rating alone: line contact gives 137 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NU rib arrangement is not interchangeable with another prefix on the same 60 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×31 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU312 skids at 5,500 r/min and fails by smearing long before L10 fatigue.", "The 137/126 kN ratings, 15.4 kN Pu and 1760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU312?", "a": "NU312 is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 137 kN, C0 126 kN, Pu 15.4 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1760 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU312 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU312 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu312", "＊＊nu312", "NU312", "NU312-NTN" ], "locale_variants": {} }, { "sku": "NU312EA", "brand": "NTN", "manufacturer_designation": "NTN NU312EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 177, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 4900, "max_rpm": 4900, "speed_oil_rpm": 7000, "weight_g": 1770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU312EA on the 60×130 mm envelope, 31 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,900 r/min. Digit by digit, NU312EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 177 kN and C0 157 kN (C0/C ≈ 0.89) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Mass 1770 g for the 60×130×31 mm NU312EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU312EA.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU312EA skids at 4,900 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 4,900 r/min and oil 7,000 r/min are different limits for NU312EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU312EA skids at 4,900 r/min and fails by smearing long before L10 fatigue.", "The 177/157 kN ratings, 19.1 kN Pu and 1770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU312EA?", "a": "NU312EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 177 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 4,900 r/min, oil 7,000 r/min, mass about 1770 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU312EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU312EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu312ea", "＊nu312ea", "NU312EA" ], "locale_variants": {} }, { "sku": "NUP2312", "brand": "NTN", "manufacturer_designation": "NTN NUP2312", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 187, "static_load_kN": 188, "fatigue_load_limit_kN": 22.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 2660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 60 mm shaft NTN supplies NUP2312: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 4,800 r/min on grease and 5,700 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). The 46 mm width and 35.0 mm section put the NUP2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NUP2312 as a pure radial bearing: keep P below 187 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Grease limiting speed 4,800 r/min and oil 5,700 r/min are different limits for NUP2312: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NUP2312 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2312 skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "Open NUP2312 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "The 187/188 kN ratings, 22.9 kN Pu and 2660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2312?", "a": "NUP2312 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 188 kN, Pu 22.9 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 2660 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2312 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2312 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2312-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2312", "＊＊nup2312", "NUP2312" ], "locale_variants": {} }, { "sku": "NUP2312EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2312EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 263, "static_load_kN": 262, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6200, "weight_g": 2730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2312EA is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 60×130×46 mm ISO 15 envelope. Digit by digit, NUP2312EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP2312EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Grease limiting speed 4,400 r/min and oil 6,200 r/min are different limits for NUP2312EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NUP rib arrangement is not interchangeable with another prefix on the same 60 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 130×46 mm envelope matches.", "Do not replace NUP2312EA with a deep-groove ball bearing on rating alone: line contact gives 263 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 263/262 kN ratings, 32 kN Pu and 2730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2312EA?", "a": "NUP2312EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 262 kN, Pu 32 kN, grease limiting speed 4,400 r/min, oil 6,200 r/min, mass about 2730 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2312EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2312EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2312ea", "＊nup2312ea", "NUP2312EA" ], "locale_variants": {} }, { "sku": "NUP312", "brand": "NTN", "manufacturer_designation": "NTN NUP312", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 137, "static_load_kN": 126, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP312 denotes a 60×130×31 mm (2.362 × 5.118 × 1.22 in) cylindrical roller bearing in the NUP300 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP312 floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. The 35.0 mm radial section ((130−60)/2) frames the roller complement; capacity per millimetre of bore is about 2.3 kN/mm before application factors. Equivalent-load planning treats NUP312 as a pure radial bearing: keep P below 137 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP312; an oversized radius locks the ring on its face and tilts the 31 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP312 skids at 5,500 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 5,500 r/min and oil 6,500 r/min are different limits for NUP312: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "The 137/126 kN ratings, 15.4 kN Pu and 1760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP312 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP312?", "a": "NUP312 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 137 kN, C0 126 kN, Pu 15.4 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1760 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP312 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP312 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP312 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP312?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 113 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP312-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup312", "＊＊nup312", "NUP312" ], "locale_variants": {} }, { "sku": "NUP312EA", "brand": "NTN", "manufacturer_designation": "NTN NUP312EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 177, "static_load_kN": 157, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 4900, "max_rpm": 4900, "speed_oil_rpm": 7000, "weight_g": 1770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP312EA is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 60×130×31 mm ISO 15 envelope. Numbering ties NUP312EA to its envelope: type code NUP, series NUP300, 60 mm bore; the 130×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 31 mm width and 35.0 mm section put the NUP300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 4,900 r/min is .70 of the 7,000 r/min oil value for NUP312EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP312EA.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The 35.0 mm section at 60 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "If the shaft must be located both ways, do not use NUP312EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NUP312EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NUP312EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "The 177/157 kN ratings, 19.1 kN Pu and 1770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP312EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP312EA?", "a": "NUP312EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 177 kN, C0 157 kN, Pu 19.1 kN, grease limiting speed 4,900 r/min, oil 7,000 r/min, mass about 1770 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP312EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP312EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP312EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 77 mm, Ew 115 mm. The nominal bore/OD remain 60/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP312EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup312ea", "＊nup312ea", "NUP312EA" ], "locale_variants": {} }, { "sku": "N412", "brand": "NTN", "manufacturer_designation": "NTN N412", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 185, "static_load_kN": 168, "fatigue_load_limit_kN": 20.2, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 2930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N412 on the 60×150 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,900 r/min. Numbering ties N412 to its envelope: type code N, series N400, 60 mm bore; the 150×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N412 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 3,900 r/min is .85 of the 4,600 r/min oil value for N412; grease-churn heating closes that gap as fill quantity rises. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Do not replace N412 with a deep-groove ball bearing on rating alone: line contact gives 185 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use N412 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Do not replace N412 with a deep-groove ball bearing on rating alone: line contact gives 185 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 185/168 kN ratings, 20.2 kN Pu and 2930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N412 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N412?", "a": "N412 is an NTN N single-row cylindrical roller bearing to ISO 15: 60 mm bore, 150 mm OD and 35 mm width (2.362 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 185 kN, C0 168 kN, Pu 20.2 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 2930 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N412 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N412 is supplied in the standard open execution shown in the table." }, { "q": "Can N412 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N412?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83 mm, Ew 127 mm. The nominal bore/OD remain 60/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N412", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n412", "N412" ], "locale_variants": {} }, { "sku": "NF412", "brand": "NTN", "manufacturer_designation": "NTN NF412", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 185, "static_load_kN": 168, "fatigue_load_limit_kN": 20.2, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 2930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF412 denotes a 60×150×35 mm (2.362 × 5.906 × 1.378 in) cylindrical roller bearing in the NF400 family, a pressed sheet-steel cage. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF412 floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NF412 designation when purchasing. The 60 mm (2.362 in) bore and 150 mm (5.906 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 35 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 60 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NF400 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 185/168 kN pair here belongs to NF412 as printed, not to the bare size.", "Grease limiting speed 3,900 r/min and oil 4,600 r/min are different limits for NF412: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "The 185/168 kN ratings, 20.2 kN Pu and 2930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF412 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF412?", "a": "NF412 is an NTN NF single-row cylindrical roller bearing to ISO 15: 60 mm bore, 150 mm OD and 35 mm width (2.362 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 185 kN, C0 168 kN, Pu 20.2 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 2930 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF412 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF412 is supplied in the standard open execution shown in the table." }, { "q": "Can NF412 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF412?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83 mm, Ew 127 mm. The nominal bore/OD remain 60/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF412", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf412", "NF412" ], "locale_variants": {} }, { "sku": "NJ412-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ412", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 185, "static_load_kN": 168, "fatigue_load_limit_kN": 20.2, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 2930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ412 appears as a 60 mm bore single-row cylindrical roller bearing (185 kN C / 168 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ412 floats or locates; the numeric remainder is the ISO 15 series and 60 mm bore reference, not a fit or clearance instruction. With C 185 kN and C0 168 kN (C0/C ≈ 0.91) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ412.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 60 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 60 mm bore share bore but not OD/width; check the full NJ400 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ412 skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "The 185/168 kN ratings, 20.2 kN Pu and 2930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ412 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ412?", "a": "NJ412 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 60 mm bore, 150 mm OD and 35 mm width (2.362 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 185 kN, C0 168 kN, Pu 20.2 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 2930 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ412 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ412 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ412 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ412?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83 mm, Ew 127 mm. The nominal bore/OD remain 60/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ412", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj412", "NJ412", "NJ412-NTN" ], "locale_variants": {} }, { "sku": "NU412-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU412", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 185, "static_load_kN": 168, "fatigue_load_limit_kN": 20.2, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 2930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU412 on the 60×150 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,900 r/min. Digit by digit, NU412 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,600 r/min with oil versus 3,900 r/min with grease (a 700 r/min band), lubrication choice for NU412 is a thermal decision, not just a sealing one. The 60 mm (2.362 in) bore and 150 mm (5.906 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 35 mm-wide ring. Heat the inner ring to max 120 °C for the 60 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Do not replace NU412 with a deep-groove ball bearing on rating alone: line contact gives 185 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 3,900 r/min and oil 4,600 r/min are different limits for NU412: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 185/168 kN ratings, 20.2 kN Pu and 2930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU412 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU412?", "a": "NU412 is an NTN NU single-row cylindrical roller bearing to ISO 15: 60 mm bore, 150 mm OD and 35 mm width (2.362 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 185 kN, C0 168 kN, Pu 20.2 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 2930 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU412 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU412 is supplied in the standard open execution shown in the table." }, { "q": "Can NU412 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU412?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83 mm, Ew 127 mm. The nominal bore/OD remain 60/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU412", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu412", "NU412", "NU412-NTN" ], "locale_variants": {} }, { "sku": "NUP412", "brand": "NTN", "manufacturer_designation": "NTN NUP412", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 185, "static_load_kN": 168, "fatigue_load_limit_kN": 20.2, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 2930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP412 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 60×150×35 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 60 mm (00–03 use the 10/12/15/17 exception table). The 35 mm width and 45.0 mm section put the NUP400 series in the heavy (04) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 60 mm (2.362 in) bore and 150 mm (5.906 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 35 mm-wide ring. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 60 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 185/168 kN pair here belongs to NUP412 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NUP412 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NUP412 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NUP412 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.", "The 185/168 kN ratings, 20.2 kN Pu and 2930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP412 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP412?", "a": "NUP412 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 60 mm bore, 150 mm OD and 35 mm width (2.362 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 185 kN, C0 168 kN, Pu 20.2 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 2930 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP412 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP412 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP412 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP412?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83 mm, Ew 127 mm. The nominal bore/OD remain 60/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP412", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup412", "NUP412" ], "locale_variants": {} }, { "sku": "N1013", "brand": "NTN", "manufacturer_designation": "NTN N1013", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 477, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N1013 denotes a 65×100×18 mm (2.559 × 3.937 × 0.709 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Numbering ties N1013 to its envelope: type code N, series N1000, 65 mm bore; the 100×18 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N1013 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 45.5 kN C assumes clean oil and adequate film; the 6.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N1013 non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 100 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 45.5/51 kN pair here belongs to N1013 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 45.5/51 kN pair here belongs to N1013 as printed, not to the bare size.", "The 18 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Do not replace N1013 with a deep-groove ball bearing on rating alone: line contact gives 45.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 45.5/51 kN ratings, 6.3 kN Pu and 477 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1013 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1013?", "a": "N1013 is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 100 mm OD and 18 mm width (2.559 × 3.937 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 45.5 kN, C0 51 kN, Pu 6.3 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 477 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1013 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1013 is supplied in the standard open execution shown in the table." }, { "q": "Can N1013 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1013?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 74.5 mm, Ew 90.5 mm. The nominal bore/OD remain 65/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1013", "N1013" ], "locale_variants": {} }, { "sku": "NJ1013", "brand": "NTN", "manufacturer_designation": "NTN NJ1013", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 477, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1013 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 65 mm shaft — 45.5 kN of basic dynamic capacity in a 477 g, open bearing. Digit by digit, NJ1013 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1013. The 0.7 kN-per-mm-bore figure (45.5 kN over 65 mm) lets a NJ1013 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NJ1013; an oversized radius locks the ring on its face and tilts the 18 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 100 mm raceway.", "Open NJ1013 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The NJ rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 100×18 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The 45.5/51 kN ratings, 6.3 kN Pu and 477 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1013 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1013?", "a": "NJ1013 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 100 mm OD and 18 mm width (2.559 × 3.937 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 45.5 kN, C0 51 kN, Pu 6.3 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 477 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1013 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1013 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1013 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1013?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 74.5 mm, Ew 90.5 mm. The nominal bore/OD remain 65/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1013", "NJ1013" ], "locale_variants": {} }, { "sku": "NN3013", "brand": "NTN", "manufacturer_designation": "NTN NN3013", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83, "static_load_kN": 111, "fatigue_load_limit_kN": 13.6, "limiting_speed_rpm": 6200, "max_rpm": 6200, "speed_oil_rpm": 7300, "weight_g": 758, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3013 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 83 kN dynamic rating in the 65 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3013 floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NN3013 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NN3013 as a pure radial bearing: keep P below 83 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 65 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 100 mm raceway.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3013 does not substitute a precision-class execution.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3013 skids at 6,200 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 6,200 r/min and oil 7,300 r/min are different limits for NN3013: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NN3013 with a deep-groove ball bearing on rating alone: line contact gives 83 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 83/111 kN ratings, 13.6 kN Pu and 758 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3013 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3013?", "a": "NN3013 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 65 mm bore, 100 mm OD and 26 mm width (2.559 × 3.937 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 6,200 r/min, oil 7,300 r/min, mass about 758 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3013 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3013 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3013?", "a": "NN3013 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3013?", "a": "NTN rates NN3013 at 6,200 r/min with grease and 7,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3013", "NN3013" ], "locale_variants": {} }, { "sku": "NN3013K", "brand": "NTN", "manufacturer_designation": "NTN NN3013K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83, "static_load_kN": 111, "fatigue_load_limit_kN": 13.6, "limiting_speed_rpm": 6200, "max_rpm": 6200, "speed_oil_rpm": 7300, "weight_g": 735, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 65 mm shaft NTN supplies NN3013K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 6,200 r/min on grease and 7,300 r/min on oil. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NN3013K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 6,200 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 7,300 r/min for continuously high-duty 65 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3013K.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 100 mm raceway.", "Grease limiting speed 6,200 r/min and oil 7,300 r/min are different limits for NN3013K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NN rib arrangement is not interchangeable with another prefix on the same 65 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 100×26 mm envelope matches.", "The 17.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 26 mm-wide cavity.", "Do not replace NN3013K with a deep-groove ball bearing on rating alone: line contact gives 83 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 83/111 kN ratings, 13.6 kN Pu and 735 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3013K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3013K?", "a": "NN3013K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 65 mm bore, 100 mm OD and 26 mm width (2.559 × 3.937 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 6,200 r/min, oil 7,300 r/min, mass about 735 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3013K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3013K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3013K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3013K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3013 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3013K?", "a": "NTN rates NN3013K at 6,200 r/min with grease and 7,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3013K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3013k", "NN3013K" ], "locale_variants": {} }, { "sku": "NU1013", "brand": "NTN", "manufacturer_designation": "NTN NU1013", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 477, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1013 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 45.5 kN dynamic rating in the 65 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1013 floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 7,000 r/min grease and 8,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 65 mm bore. Speed ratio check: limiting 7,000 r/min is .85 of the 8,200 r/min oil value for NU1013; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 65 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 100 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 45.5/51 kN pair here belongs to NU1013 as printed, not to the bare size.", "The NU rib arrangement is not interchangeable with another prefix on the same 65 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 100×18 mm envelope matches.", "If the shaft must be located both ways, do not use NU1013 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 45.5/51 kN ratings, 6.3 kN Pu and 477 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1013 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1013?", "a": "NU1013 is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 100 mm OD and 18 mm width (2.559 × 3.937 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 45.5 kN, C0 51 kN, Pu 6.3 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 477 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1013 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1013 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1013 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1013?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 74.5 mm, Ew 90.5 mm. The nominal bore/OD remain 65/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1013-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1013-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1013", "NU1013" ], "locale_variants": {} }, { "sku": "NUP1013", "brand": "NTN", "manufacturer_designation": "NTN NUP1013", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 51, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 7000, "max_rpm": 7000, "speed_oil_rpm": 8200, "weight_g": 477, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1013 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 45.5 kN dynamic rating in the 65 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1013 floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP1013 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 477 g for the 65×100×18 mm NUP1013 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 100 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 100 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NUP1013 with a deep-groove ball bearing on rating alone: line contact gives 45.5 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 45.5/51 kN ratings, 6.3 kN Pu and 477 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1013 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1013?", "a": "NUP1013 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 100 mm OD and 18 mm width (2.559 × 3.937 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 45.5 kN, C0 51 kN, Pu 6.3 kN, grease limiting speed 7,000 r/min, oil 8,200 r/min, mass about 477 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1013 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1013 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1013 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1013?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 74.5 mm, Ew 90.5 mm. The nominal bore/OD remain 65/100 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 7,000 r/min grease / 8,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1013", "NUP1013" ], "locale_variants": {} }, { "sku": "N213", "brand": "NTN", "manufacturer_designation": "NTN N213", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93, "static_load_kN": 94.5, "fatigue_load_limit_kN": 11.5, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N213 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 93 kN dynamic rating in the 65 mm bore. Numbering ties N213 to its envelope: type code N, series N200, 65 mm bore; the 120×23 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 23 mm width and 27.5 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 65 mm (2.559 in) bore and 120 mm (4.724 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of N213; an oversized radius locks the ring on its face and tilts the 23 mm-wide seat.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "The 27.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 93/94.5 kN pair here belongs to N213 as printed, not to the bare size.", "Do not replace N213 with a deep-groove ball bearing on rating alone: line contact gives 93 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open N213 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 93/94.5 kN ratings, 11.5 kN Pu and 1000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N213?", "a": "N213 is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 93 kN, C0 94.5 kN, Pu 11.5 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N213 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N213 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N213-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n213", "＊＊n213", "N213" ], "locale_variants": {} }, { "sku": "N213EA", "brand": "NTN", "manufacturer_designation": "NTN N213EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 127, "static_load_kN": 119, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 7600, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N213EA on the 65×120 mm envelope, 23 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 5,400 r/min. Digit by digit, N213EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 127 kN and C0 119 kN (C0/C ≈ 0.94) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Speed ratio check: limiting 5,400 r/min is .71 of the 7,600 r/min oil value for N213EA; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 65 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Grease limiting speed 5,400 r/min and oil 7,600 r/min are different limits for N213EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 5,400 r/min and oil 7,600 r/min are different limits for N213EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N213EA skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "The 127/119 kN ratings, 14.5 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N213EA?", "a": "N213EA is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 127 kN, C0 119 kN, Pu 14.5 kN, grease limiting speed 5,400 r/min, oil 7,600 r/min, mass about 1010 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N213EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N213EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n213ea", "＊n213ea", "N213EA" ], "locale_variants": {} }, { "sku": "N2213", "brand": "NTN", "manufacturer_designation": "NTN N2213", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 133, "static_load_kN": 149, "fatigue_load_limit_kN": 18.2, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2213 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 65×120×31 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). With C 133 kN and C0 149 kN (C0/C ≈ 1.12) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Rating life at 133 kN C assumes clean oil and adequate film; the 18.2 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of N2213; an oversized radius locks the ring on its face and tilts the 31 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Do not replace N2213 with a deep-groove ball bearing on rating alone: line contact gives 133 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2213 skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "The 133/149 kN ratings, 18.2 kN Pu and 1370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2213?", "a": "N2213 is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 133 kN, C0 149 kN, Pu 18.2 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2213 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2213 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2213", "＊＊n2213", "N2213" ], "locale_variants": {} }, { "sku": "N2213EA", "brand": "NTN", "manufacturer_designation": "NTN N2213EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 176, "static_load_kN": 181, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 6700, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2213EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 176 kN dynamic rating in the 65 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N2213EA floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 4,800 r/min grease and 6,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 65 mm bore. Selection arithmetic: Pu 22.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.03 (181/176 kN) shows the high-static-capacity proportioning of this 65 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2213EA.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "If the shaft must be located both ways, do not use N2213EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2213EA skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "The 27.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "If the shaft must be located both ways, do not use N2213EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 176/181 kN ratings, 22.1 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2213EA?", "a": "N2213EA is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 176 kN, C0 181 kN, Pu 22.1 kN, grease limiting speed 4,800 r/min, oil 6,700 r/min, mass about 1440 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2213EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2213EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2213ea", "＊n2213ea", "N2213EA" ], "locale_variants": {} }, { "sku": "NF213", "brand": "NTN", "manufacturer_designation": "NTN NF213", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93, "static_load_kN": 94.5, "fatigue_load_limit_kN": 11.5, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF213 on the 65×120 mm envelope, 23 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,900 r/min. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF213 floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 5,900 r/min grease and 7,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 65 mm bore. Thermal planning around the 5,900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 7,000 r/min for continuously high-duty 65 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF213 non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Grease limiting speed 5,900 r/min and oil 7,000 r/min are different limits for NF213: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 23 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NF213 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 93/94.5 kN ratings, 11.5 kN Pu and 1000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF213?", "a": "NF213 is an NTN NF single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 93 kN, C0 94.5 kN, Pu 11.5 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF213 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF213 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf213", "＊＊nf213", "NF213" ], "locale_variants": {} }, { "sku": "NF213EA", "brand": "NTN", "manufacturer_designation": "NTN NF213EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 127, "static_load_kN": 119, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 7600, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF213EA appears as a 65 mm bore single-row cylindrical roller bearing (127 kN C / 119 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF213EA floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NF213EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 65 mm (2.559 in) bore and 120 mm (4.724 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 65 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 127/119 kN pair here belongs to NF213EA as printed, not to the bare size.", "Open NF213EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 127/119 kN ratings, 14.5 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF213EA?", "a": "NF213EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 127 kN, C0 119 kN, Pu 14.5 kN, grease limiting speed 5,400 r/min, oil 7,600 r/min, mass about 1010 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF213EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF213EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf213ea", "＊nf213ea", "NF213EA" ], "locale_variants": {} }, { "sku": "NF2213EA", "brand": "NTN", "manufacturer_designation": "NTN NF2213EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 176, "static_load_kN": 181, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 6700, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 65 mm shaft NTN supplies NF2213EA: one integral rib on each ring; the open execution is rated 4,800 r/min on grease and 6,700 r/min on oil. Numbering ties NF2213EA to its envelope: type code NF, series NF2200, 65 mm bore; the 120×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 4,800 r/min grease and 6,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 65 mm bore. Selection arithmetic: Pu 22.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.03 (181/176 kN) shows the high-static-capacity proportioning of this 65 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 65 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 176/181 kN pair here belongs to NF2213EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NF2213EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NF2213EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 176/181 kN ratings, 22.1 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2213EA?", "a": "NF2213EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 176 kN, C0 181 kN, Pu 22.1 kN, grease limiting speed 4,800 r/min, oil 6,700 r/min, mass about 1440 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2213EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2213EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2213ea", "＊nf2213ea", "NF2213EA" ], "locale_variants": {} }, { "sku": "NJ213", "brand": "NTN", "manufacturer_designation": "NTN NJ213", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93, "static_load_kN": 94.5, "fatigue_load_limit_kN": 11.5, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ213 appears as a 65 mm bore single-row cylindrical roller bearing (93 kN C / 94.5 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ213 floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. The 23 mm width and 27.5 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 65 mm (2.559 in) bore and 120 mm (4.724 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 23 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 65 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Open NJ213 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The NJ rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 120×23 mm envelope matches.", "Grease limiting speed 5,900 r/min and oil 7,000 r/min are different limits for NJ213: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NJ213 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 93/94.5 kN ratings, 11.5 kN Pu and 1000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ213?", "a": "NJ213 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 93 kN, C0 94.5 kN, Pu 11.5 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ213 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ213 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ213-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj213", "＊＊nj213", "NJ213" ], "locale_variants": {} }, { "sku": "NJ213EA", "brand": "NTN", "manufacturer_designation": "NTN NJ213EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 127, "static_load_kN": 119, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 7600, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 65 mm shaft NTN supplies NJ213EA: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 5,400 r/min on grease and 7,600 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ213EA floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ213EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ213EA.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Grease limiting speed 5,400 r/min and oil 7,600 r/min are different limits for NJ213EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NJ rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 120×23 mm envelope matches.", "The NJ rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 120×23 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 127/119 kN ratings, 14.5 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ213EA?", "a": "NJ213EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 127 kN, C0 119 kN, Pu 14.5 kN, grease limiting speed 5,400 r/min, oil 7,600 r/min, mass about 1010 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ213EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ213EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj213ea", "＊nj213ea", "NJ213EA" ], "locale_variants": {} }, { "sku": "NJ2213", "brand": "NTN", "manufacturer_designation": "NTN NJ2213", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 133, "static_load_kN": 149, "fatigue_load_limit_kN": 18.2, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2213 denotes a 65×120×31 mm (2.559 × 4.724 × 1.22 in) cylindrical roller bearing in the NJ2200 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2213 floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. The 31 mm width and 27.5 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 65 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2213 skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "The NJ rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 120×31 mm envelope matches.", "Open NJ2213 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 133/149 kN ratings, 18.2 kN Pu and 1370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2213?", "a": "NJ2213 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 133 kN, C0 149 kN, Pu 18.2 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2213 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2213 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2213-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2213", "＊＊nj2213", "NJ2213" ], "locale_variants": {} }, { "sku": "NJ2213EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2213EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 176, "static_load_kN": 181, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 6700, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 65 mm shaft NTN supplies NJ2213EA: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 4,800 r/min on grease and 6,700 r/min on oil. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ2213EA designation when purchasing. Rating life at 176 kN C assumes clean oil and adequate film; the 22.1 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2213EA.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Open NJ2213EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "The 176/181 kN ratings, 22.1 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2213EA?", "a": "NJ2213EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 176 kN, C0 181 kN, Pu 22.1 kN, grease limiting speed 4,800 r/min, oil 6,700 r/min, mass about 1440 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2213EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2213EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2213ea", "＊nj2213ea", "NJ2213EA" ], "locale_variants": {} }, { "sku": "NU213-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU213", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93, "static_load_kN": 94.5, "fatigue_load_limit_kN": 11.5, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU213 appears as a 65 mm bore single-row cylindrical roller bearing (93 kN C / 94.5 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 120 mm OD and 23 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NU213 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 1000 g for the 65×120×23 mm NU213 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 65 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 93/94.5 kN pair here belongs to NU213 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 93/94.5 kN ratings, 11.5 kN Pu and 1000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU213?", "a": "NU213 is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 93 kN, C0 94.5 kN, Pu 11.5 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU213 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU213 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu213", "＊＊nu213", "NU213", "NU213-NTN" ], "locale_variants": {} }, { "sku": "NU213EA", "brand": "NTN", "manufacturer_designation": "NTN NU213EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 127, "static_load_kN": 119, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 7600, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU213EA denotes a 65×120×23 mm (2.559 × 4.724 × 0.906 in) cylindrical roller bearing in the NU200 family, the EA high-capacity pressed sheet-steel cage. Digit by digit, NU213EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 23 mm width and 27.5 mm section put the NU200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 5,400 r/min is .71 of the 7,600 r/min oil value for NU213EA; grease-churn heating closes that gap as fill quantity rises. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU213EA skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "The 27.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NU213EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 127/119 kN ratings, 14.5 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU213EA?", "a": "NU213EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 127 kN, C0 119 kN, Pu 14.5 kN, grease limiting speed 5,400 r/min, oil 7,600 r/min, mass about 1010 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU213EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU213EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu213ea", "＊nu213ea", "NU213EA" ], "locale_variants": {} }, { "sku": "NU2213", "brand": "NTN", "manufacturer_designation": "NTN NU2213", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 133, "static_load_kN": 149, "fatigue_load_limit_kN": 18.2, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2213 appears as a 65 mm bore single-row cylindrical roller bearing (133 kN C / 149 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU2213 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 6,300 r/min with oil versus 5,400 r/min with grease (a 900 r/min band), lubrication choice for NU2213 is a thermal decision, not just a sealing one. The 2.0 kN-per-mm-bore figure (133 kN over 65 mm) lets a NU2213 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 65 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2213 skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "Do not replace NU2213 with a deep-groove ball bearing on rating alone: line contact gives 133 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 5,400 r/min and oil 6,300 r/min are different limits for NU2213: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 133/149 kN ratings, 18.2 kN Pu and 1370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2213?", "a": "NU2213 is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 133 kN, C0 149 kN, Pu 18.2 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2213 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2213 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2213-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2213", "＊＊nu2213", "NU2213" ], "locale_variants": {} }, { "sku": "NU2213EA", "brand": "NTN", "manufacturer_designation": "NTN NU2213EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 176, "static_load_kN": 181, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 6700, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2213EA is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 65×120×31 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 120 mm OD and 31 mm width from the ISO 15 general plan. With C 176 kN and C0 181 kN (C0/C ≈ 1.03) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Mass 1440 g for the 65×120×31 mm NU2213EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 65 mm shaft.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "If the shaft must be located both ways, do not use NU2213EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NU2213EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2213EA skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "The 176/181 kN ratings, 22.1 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2213EA?", "a": "NU2213EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 176 kN, C0 181 kN, Pu 22.1 kN, grease limiting speed 4,800 r/min, oil 6,700 r/min, mass about 1440 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2213EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2213EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2213ea", "＊nu2213ea", "NU2213EA" ], "locale_variants": {} }, { "sku": "NUP213", "brand": "NTN", "manufacturer_designation": "NTN NUP213", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93, "static_load_kN": 94.5, "fatigue_load_limit_kN": 11.5, "limiting_speed_rpm": 5900, "max_rpm": 5900, "speed_oil_rpm": 7000, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP213 on the 65×120 mm envelope, 23 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,900 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP213. Thermal planning around the 5,900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 7,000 r/min for continuously high-duty 65 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 120×23 mm envelope matches.", "If the shaft must be located both ways, do not use NUP213 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The 93/94.5 kN ratings, 11.5 kN Pu and 1000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP213?", "a": "NUP213 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 93 kN, C0 94.5 kN, Pu 11.5 kN, grease limiting speed 5,900 r/min, oil 7,000 r/min, mass about 1000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP213 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP213 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,900 r/min grease / 7,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP213-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup213", "＊＊nup213", "NUP213" ], "locale_variants": {} }, { "sku": "NUP213EA", "brand": "NTN", "manufacturer_designation": "NTN NUP213EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 127, "static_load_kN": 119, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 7600, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP213EA appears as a 65 mm bore single-row cylindrical roller bearing (127 kN C / 119 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 120 mm OD and 23 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP213EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 14.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.94 (119/127 kN) shows the high-static-capacity proportioning of this 65 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP213EA.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Open NUP213EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 27.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 23 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 127/119 kN pair here belongs to NUP213EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 127/119 kN ratings, 14.5 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP213EA?", "a": "NUP213EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 23 mm width (2.559 × 4.724 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 127 kN, C0 119 kN, Pu 14.5 kN, grease limiting speed 5,400 r/min, oil 7,600 r/min, mass about 1010 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP213EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP213EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup213ea", "＊nup213ea", "NUP213EA" ], "locale_variants": {} }, { "sku": "NUP2213", "brand": "NTN", "manufacturer_designation": "NTN NUP2213", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 133, "static_load_kN": 149, "fatigue_load_limit_kN": 18.2, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2213 is the wide (22) section of the NTN NUP2200 dimension series for a 65 mm shaft — 133 kN of basic dynamic capacity in a 1370 g, open bearing. Digit by digit, NUP2213 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP2213 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 5,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 6,300 r/min for continuously high-duty 65 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 65 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2213 skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "Do not replace NUP2213 with a deep-groove ball bearing on rating alone: line contact gives 133 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2213 skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "Do not replace NUP2213 with a deep-groove ball bearing on rating alone: line contact gives 133 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 133/149 kN ratings, 18.2 kN Pu and 1370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2213 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2213?", "a": "NUP2213 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 133 kN, C0 149 kN, Pu 18.2 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1370 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2213 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2213 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2213 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2213?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 79.6 mm, Ew 105.6 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2213-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2213", "＊＊nup2213", "NUP2213" ], "locale_variants": {} }, { "sku": "NUP2213EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2213EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 176, "static_load_kN": 181, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 6700, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2213EA is the wide (22) section of the NTN NUP2200 dimension series for a 65 mm shaft — 176 kN of basic dynamic capacity in a 1440 g, open bearing. Numbering ties NUP2213EA to its envelope: type code NUP, series NUP2200, 65 mm bore; the 120×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2213EA. Rating life at 176 kN C assumes clean oil and adequate film; the 22.1 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2213EA.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 120 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2213EA skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "The 27.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Grease limiting speed 4,800 r/min and oil 6,700 r/min are different limits for NUP2213EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 120 mm race brinells and releases as vibration within hours.", "The 176/181 kN ratings, 22.1 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2213EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2213EA?", "a": "NUP2213EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 176 kN, C0 181 kN, Pu 22.1 kN, grease limiting speed 4,800 r/min, oil 6,700 r/min, mass about 1440 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2213EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2213EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2213EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 78.5 mm, Ew 108.5 mm. The nominal bore/OD remain 65/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2213EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2213ea", "＊nup2213ea", "NUP2213EA" ], "locale_variants": {} }, { "sku": "N2313", "brand": "NTN", "manufacturer_designation": "NTN N2313", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 208, "static_load_kN": 212, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2313 on the 65×140 mm envelope, 48 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,400 r/min. Digit by digit, N2313 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives N2313 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 25.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.02 (212/208 kN) shows the high-static-capacity proportioning of this 65 mm bore. Housing and shaft fillets must clear the ring chamfers of N2313; an oversized radius locks the ring on its face and tilts the 48 mm-wide seat.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2313 skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 208/212 kN ratings, 25.7 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2313?", "a": "N2313 is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 208 kN, C0 212 kN, Pu 25.7 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3200 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2313 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2313 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2313", "＊＊n2313", "N2313" ], "locale_variants": {} }, { "sku": "N2313EA", "brand": "NTN", "manufacturer_designation": "NTN N2313EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 293, "static_load_kN": 287, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2313EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 65×140×48 mm ISO 15 envelope. Digit by digit, N2313EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 5,800 r/min with oil versus 4,100 r/min with grease (a 1,700 r/min band), lubrication choice for N2313EA is a thermal decision, not just a sealing one. Mass 3250 g for the 65×140×48 mm N2313EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2313EA.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2313EA skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The N rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×48 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 4,100 r/min and oil 5,800 r/min are different limits for N2313EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 293/287 kN ratings, 34.5 kN Pu and 3250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2313EA?", "a": "N2313EA is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 293 kN, C0 287 kN, Pu 34.5 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 3250 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2313EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2313EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2313ea", "＊n2313ea", "N2313EA" ], "locale_variants": {} }, { "sku": "N313", "brand": "NTN", "manufacturer_designation": "NTN N313", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 150, "static_load_kN": 139, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 2180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N313 appears as a 65 mm bore single-row cylindrical roller bearing (150 kN C / 139 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 140 mm OD and 33 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 5,100 r/min grease and 6,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 65 mm bore. Rating life at 150 kN C assumes clean oil and adequate film; the 16.8 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 65 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Open N313 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use N313 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 150/139 kN ratings, 16.8 kN Pu and 2180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N313?", "a": "N313 is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 150 kN, C0 139 kN, Pu 16.8 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 2180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N313 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N313 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N313-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n313", "＊＊n313", "N313" ], "locale_variants": {} }, { "sku": "N313EA", "brand": "NTN", "manufacturer_designation": "NTN N313EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 213, "static_load_kN": 191, "fatigue_load_limit_kN": 23.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 6500, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N313EA is the standard section of the NTN N300 dimension series for a 65 mm shaft — 213 kN of basic dynamic capacity in a 2200 g, open bearing. Numbering ties N313EA to its envelope: type code N, series N300, 65 mm bore; the 140×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 33 mm width and 37.5 mm section put the N300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 65 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 37.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N313EA skids at 4,600 r/min and fails by smearing long before L10 fatigue.", "The N rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "Open N313EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 213/191 kN ratings, 23.1 kN Pu and 2200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N313EA?", "a": "N313EA is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 213 kN, C0 191 kN, Pu 23.1 kN, grease limiting speed 4,600 r/min, oil 6,500 r/min, mass about 2200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N313EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N313EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n313ea", "＊n313ea", "N313EA" ], "locale_variants": {} }, { "sku": "NF2313EA", "brand": "NTN", "manufacturer_designation": "NTN NF2313EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 293, "static_load_kN": 287, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2313EA is the extra-wide (23) section of the NTN NF2300 dimension series for a 65 mm shaft — 293 kN of basic dynamic capacity in a 3250 g, open bearing. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 140 mm OD and 48 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NF2313EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 4,100 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 5,800 r/min for continuously high-duty 65 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF2313EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NF2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 293/287 kN pair here belongs to NF2313EA as printed, not to the bare size.", "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Do not replace NF2313EA with a deep-groove ball bearing on rating alone: line contact gives 293 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 293/287 kN ratings, 34.5 kN Pu and 3250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2313EA?", "a": "NF2313EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 293 kN, C0 287 kN, Pu 34.5 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 3250 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2313EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2313EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2313ea", "＊nf2313ea", "NF2313EA" ], "locale_variants": {} }, { "sku": "NF313", "brand": "NTN", "manufacturer_designation": "NTN NF313", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 150, "static_load_kN": 139, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 2180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 65 mm shaft NTN supplies NF313: one integral rib on each ring; the open execution is rated 5,100 r/min on grease and 6,000 r/min on oil. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF313. Selection arithmetic: Pu 16.8 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.93 (139/150 kN) shows the high-static-capacity proportioning of this 65 mm bore. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 37.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The 37.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Grease limiting speed 5,100 r/min and oil 6,000 r/min are different limits for NF313: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 150/139 kN ratings, 16.8 kN Pu and 2180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF313?", "a": "NF313 is an NTN NF single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 150 kN, C0 139 kN, Pu 16.8 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 2180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF313 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF313 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf313", "＊＊nf313", "NF313" ], "locale_variants": {} }, { "sku": "NF313EA", "brand": "NTN", "manufacturer_designation": "NTN NF313EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 213, "static_load_kN": 191, "fatigue_load_limit_kN": 23.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 6500, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF313EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 65×140×33 mm ISO 15 envelope. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). The 37.5 mm radial section ((140−65)/2) frames the roller complement; capacity per millimetre of bore is about 3.3 kN/mm before application factors. Equivalent-load planning treats NF313EA as a pure radial bearing: keep P below 213 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF313EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The NF rib arrangement is not interchangeable with another prefix on the same 65 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "The 37.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The 213/191 kN ratings, 23.1 kN Pu and 2200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF313EA?", "a": "NF313EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 213 kN, C0 191 kN, Pu 23.1 kN, grease limiting speed 4,600 r/min, oil 6,500 r/min, mass about 2200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF313EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF313EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf313ea", "＊nf313ea", "NF313EA" ], "locale_variants": {} }, { "sku": "NJ2313", "brand": "NTN", "manufacturer_designation": "NTN NJ2313", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 208, "static_load_kN": 212, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2313 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 65×140×48 mm ISO 15 envelope. Digit by digit, NJ2313 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 4,400 r/min grease and 5,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 65 mm bore. The 65 mm (2.559 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 48 mm-wide ring. Heat the inner ring to max 120 °C for the 65 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 208/212 kN pair here belongs to NJ2313 as printed, not to the bare size.", "Do not replace NJ2313 with a deep-groove ball bearing on rating alone: line contact gives 208 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 208/212 kN pair here belongs to NJ2313 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NJ2313 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 208/212 kN ratings, 25.7 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2313?", "a": "NJ2313 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 208 kN, C0 212 kN, Pu 25.7 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3200 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2313 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2313 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2313-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2313", "＊＊nj2313", "NJ2313" ], "locale_variants": {} }, { "sku": "NJ2313EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2313EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 293, "static_load_kN": 287, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2313EA denotes a 65×140×48 mm (2.559 × 5.512 × 1.89 in) cylindrical roller bearing in the NJ2300 family, the EA high-capacity pressed sheet-steel cage. Digit by digit, NJ2313EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 65 mm (2.559 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 48 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2313EA.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "If the shaft must be located both ways, do not use NJ2313EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "The NJ rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 140×48 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 293/287 kN pair here belongs to NJ2313EA as printed, not to the bare size.", "The 293/287 kN ratings, 34.5 kN Pu and 3250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2313EA?", "a": "NJ2313EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 293 kN, C0 287 kN, Pu 34.5 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 3250 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2313EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2313EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2313ea", "＊nj2313ea", "NJ2313EA" ], "locale_variants": {} }, { "sku": "NJ313", "brand": "NTN", "manufacturer_designation": "NTN NJ313", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 150, "static_load_kN": 139, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 2180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ313 is the standard section of the NTN NJ300 dimension series for a 65 mm shaft — 150 kN of basic dynamic capacity in a 2180 g, open bearing. Digit by digit, NJ313 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 65 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ313. Mass 2180 g for the 65×140×33 mm NJ313 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 65 mm shaft.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Open NJ313 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 150/139 kN ratings, 16.8 kN Pu and 2180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ313?", "a": "NJ313 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 150 kN, C0 139 kN, Pu 16.8 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 2180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ313 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ313 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ313-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj313", "＊＊nj313", "NJ313" ], "locale_variants": {} }, { "sku": "NJ313EA", "brand": "NTN", "manufacturer_designation": "NTN NJ313EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 213, "static_load_kN": 191, "fatigue_load_limit_kN": 23.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 6500, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ313EA denotes a 65×140×33 mm (2.559 × 5.512 × 1.299 in) cylindrical roller bearing in the NJ300 family, the EA high-capacity pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ313EA. The 3.3 kN-per-mm-bore figure (213 kN over 65 mm) lets a NJ313EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ313EA.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 37.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ313EA skids at 4,600 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 213/191 kN ratings, 23.1 kN Pu and 2200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ313EA?", "a": "NJ313EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 213 kN, C0 191 kN, Pu 23.1 kN, grease limiting speed 4,600 r/min, oil 6,500 r/min, mass about 2200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ313EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ313EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj313ea", "＊nj313ea", "NJ313EA" ], "locale_variants": {} }, { "sku": "NU2313", "brand": "NTN", "manufacturer_designation": "NTN NU2313", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 208, "static_load_kN": 212, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2313 is the extra-wide (23) section of the NTN NU2300 dimension series for a 65 mm shaft — 208 kN of basic dynamic capacity in a 3200 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 140 mm OD and 48 mm width from the ISO 15 general plan. The 48 mm width and 37.5 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 65 mm (2.559 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 48 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 65 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 208/212 kN pair here belongs to NU2313 as printed, not to the bare size.", "Open NU2313 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 208/212 kN ratings, 25.7 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2313?", "a": "NU2313 is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 208 kN, C0 212 kN, Pu 25.7 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3200 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2313 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2313 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2313-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2313", "＊＊nu2313", "NU2313" ], "locale_variants": {} }, { "sku": "NU2313EA", "brand": "NTN", "manufacturer_designation": "NTN NU2313EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 293, "static_load_kN": 287, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2313EA appears as a 65 mm bore single-row cylindrical roller bearing (293 kN C / 287 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2313EA floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. The 48 mm width and 37.5 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 34.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.98 (287/293 kN) shows the high-static-capacity proportioning of this 65 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 65 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Do not replace NU2313EA with a deep-groove ball bearing on rating alone: line contact gives 293 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Open NU2313EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 293/287 kN ratings, 34.5 kN Pu and 3250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2313EA?", "a": "NU2313EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 293 kN, C0 287 kN, Pu 34.5 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 3250 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2313EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2313EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2313ea", "＊nu2313ea", "NU2313EA" ], "locale_variants": {} }, { "sku": "NU313-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU313", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 150, "static_load_kN": 139, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 2180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU313 on the 65×140 mm envelope, 33 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,100 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). The 33 mm width and 37.5 mm section put the NU300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Heat the inner ring to max 120 °C for the 65 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 150/139 kN pair here belongs to NU313 as printed, not to the bare size.", "Open NU313 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU313 skids at 5,100 r/min and fails by smearing long before L10 fatigue.", "Open NU313 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 150/139 kN ratings, 16.8 kN Pu and 2180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU313?", "a": "NU313 is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 150 kN, C0 139 kN, Pu 16.8 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 2180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU313 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU313 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu313", "＊＊nu313", "NU313", "NU313-NTN" ], "locale_variants": {} }, { "sku": "NU313EA", "brand": "NTN", "manufacturer_designation": "NTN NU313EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 213, "static_load_kN": 191, "fatigue_load_limit_kN": 23.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 6500, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 65 mm shaft NTN supplies NU313EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,600 r/min on grease and 6,500 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 140 mm OD and 33 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NU313EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NU313EA as a pure radial bearing: keep P below 213 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU313EA.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NU313EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU313EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 213/191 kN ratings, 23.1 kN Pu and 2200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU313EA?", "a": "NU313EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 213 kN, C0 191 kN, Pu 23.1 kN, grease limiting speed 4,600 r/min, oil 6,500 r/min, mass about 2200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU313EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU313EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu313ea", "＊nu313ea", "NU313EA" ], "locale_variants": {} }, { "sku": "NUP2313", "brand": "NTN", "manufacturer_designation": "NTN NUP2313", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 208, "static_load_kN": 212, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2313 denotes a 65×140×48 mm (2.559 × 5.512 × 1.89 in) cylindrical roller bearing in the NUP2300 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 140 mm OD and 48 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 83.5 mm and Ew 121.5 mm — the envelope inside the 65/140 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 65 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 65 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 4,400 r/min and oil 5,200 r/min are different limits for NUP2313: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NUP2313 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NUP rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 140×48 mm envelope matches.", "The 208/212 kN ratings, 25.7 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2313?", "a": "NUP2313 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 208 kN, C0 212 kN, Pu 25.7 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3200 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2313 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2313 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2313-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2313", "＊＊nup2313", "NUP2313" ], "locale_variants": {} }, { "sku": "NUP2313EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2313EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 293, "static_load_kN": 287, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2313EA on the 65×140 mm envelope, 48 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,100 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 140 mm OD and 48 mm width from the ISO 15 general plan. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP2313EA designation when purchasing. The 65 mm (2.559 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 48 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP2313EA; an oversized radius locks the ring on its face and tilts the 48 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 293/287 kN pair here belongs to NUP2313EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use NUP2313EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 293/287 kN pair here belongs to NUP2313EA as printed, not to the bare size.", "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "The 293/287 kN ratings, 34.5 kN Pu and 3250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2313EA?", "a": "NUP2313EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 293 kN, C0 287 kN, Pu 34.5 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 3250 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2313EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2313EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2313ea", "＊nup2313ea", "NUP2313EA" ], "locale_variants": {} }, { "sku": "NUP313", "brand": "NTN", "manufacturer_designation": "NTN NUP313", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 150, "static_load_kN": 139, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 2180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP313 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 150 kN dynamic rating in the 65 mm bore. Numbering ties NUP313 to its envelope: type code NUP, series NUP300, 65 mm bore; the 140×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP313 designation when purchasing. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Heat the inner ring to max 120 °C for the 65 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 37.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP313 skids at 5,100 r/min and fails by smearing long before L10 fatigue.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "The 150/139 kN ratings, 16.8 kN Pu and 2180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP313 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP313?", "a": "NUP313 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 150 kN, C0 139 kN, Pu 16.8 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 2180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP313 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP313 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP313 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP313?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 121.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP313-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup313", "＊＊nup313", "NUP313" ], "locale_variants": {} }, { "sku": "NUP313EA", "brand": "NTN", "manufacturer_designation": "NTN NUP313EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 213, "static_load_kN": 191, "fatigue_load_limit_kN": 23.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 6500, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP313EA on the 65×140 mm envelope, 33 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,600 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP313EA floats or locates; the numeric remainder is the ISO 15 series and 65 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP313EA. Thermal planning around the 4,600 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 6,500 r/min for continuously high-duty 65 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP313EA.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "If the shaft must be located both ways, do not use NUP313EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 213/191 kN pair here belongs to NUP313EA as printed, not to the bare size.", "The 37.5 mm section at 65 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 213/191 kN ratings, 23.1 kN Pu and 2200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP313EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP313EA?", "a": "NUP313EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 213 kN, C0 191 kN, Pu 23.1 kN, grease limiting speed 4,600 r/min, oil 6,500 r/min, mass about 2200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP313EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP313EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP313EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 82.5 mm, Ew 124.5 mm. The nominal bore/OD remain 65/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP313EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup313ea", "＊nup313ea", "NUP313EA" ], "locale_variants": {} }, { "sku": "N413", "brand": "NTN", "manufacturer_designation": "NTN N413", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 202, "static_load_kN": 186, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N413 is the heavy (04) section of the NTN N400 dimension series for a 65 mm shaft — 202 kN of basic dynamic capacity in a 3500 g, open bearing. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). With C 202 kN and C0 186 kN (C0/C ≈ 0.92) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 3.1 kN-per-mm-bore figure (202 kN over 65 mm) lets a N413 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 65 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 47.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "Open N413 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N413 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The 202/186 kN ratings, 21.9 kN Pu and 3500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N413 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N413?", "a": "N413 is an NTN N single-row cylindrical roller bearing to ISO 15: 65 mm bore, 160 mm OD and 37 mm width (2.559 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 202 kN, C0 186 kN, Pu 21.9 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N413 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N413 is supplied in the standard open execution shown in the table." }, { "q": "Can N413 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N413?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89.3 mm, Ew 135.3 mm. The nominal bore/OD remain 65/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N413", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n413", "N413" ], "locale_variants": {} }, { "sku": "NF413", "brand": "NTN", "manufacturer_designation": "NTN NF413", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 202, "static_load_kN": 186, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF413 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 202 kN dynamic rating in the 65 mm bore. Numbering ties NF413 to its envelope: type code NF, series NF400, 65 mm bore; the 160×37 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 3,600 r/min is .84 of the 4,300 r/min oil value for NF413; grease-churn heating closes that gap as fill quantity rises. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "If the shaft must be located both ways, do not use NF413 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 37 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 202/186 kN pair here belongs to NF413 as printed, not to the bare size.", "The 202/186 kN ratings, 21.9 kN Pu and 3500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF413 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF413?", "a": "NF413 is an NTN NF single-row cylindrical roller bearing to ISO 15: 65 mm bore, 160 mm OD and 37 mm width (2.559 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 202 kN, C0 186 kN, Pu 21.9 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF413 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF413 is supplied in the standard open execution shown in the table." }, { "q": "Can NF413 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF413?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89.3 mm, Ew 135.3 mm. The nominal bore/OD remain 65/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF413", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf413", "NF413" ], "locale_variants": {} }, { "sku": "NJ413-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ413", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 202, "static_load_kN": 186, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ413 on the 65×160 mm envelope, 37 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,600 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 65 mm (00–03 use the 10/12/15/17 exception table). The 37 mm width and 47.5 mm section put the NJ400 series in the heavy (04) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 3.1 kN-per-mm-bore figure (202 kN over 65 mm) lets a NJ413 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ413.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The NJ rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 160×37 mm envelope matches.", "The 37 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 65 mm inner ring.", "Open NJ413 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "Open NJ413 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 202/186 kN ratings, 21.9 kN Pu and 3500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ413 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ413?", "a": "NJ413 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 65 mm bore, 160 mm OD and 37 mm width (2.559 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 202 kN, C0 186 kN, Pu 21.9 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ413 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ413 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ413 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ413?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89.3 mm, Ew 135.3 mm. The nominal bore/OD remain 65/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ413", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj413", "NJ413", "NJ413-NTN" ], "locale_variants": {} }, { "sku": "NU413-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU413", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 202, "static_load_kN": 186, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU413 appears as a 65 mm bore single-row cylindrical roller bearing (202 kN C / 186 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NU413 to its envelope: type code NU, series NU400, 65 mm bore; the 160×37 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 202 kN and C0 186 kN (C0/C ≈ 0.92) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Equivalent-load planning treats NU413 as a pure radial bearing: keep P below 202 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU413 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 202/186 kN pair here belongs to NU413 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NU413 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU413 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The 202/186 kN ratings, 21.9 kN Pu and 3500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU413 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU413?", "a": "NU413 is an NTN NU single-row cylindrical roller bearing to ISO 15: 65 mm bore, 160 mm OD and 37 mm width (2.559 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 202 kN, C0 186 kN, Pu 21.9 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU413 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU413 is supplied in the standard open execution shown in the table." }, { "q": "Can NU413 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU413?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89.3 mm, Ew 135.3 mm. The nominal bore/OD remain 65/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU413", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu413", "NU413", "NU413-NTN" ], "locale_variants": {} }, { "sku": "NUP413", "brand": "NTN", "manufacturer_designation": "NTN NUP413", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 202, "static_load_kN": 186, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP413 appears as a 65 mm bore single-row cylindrical roller bearing (202 kN C / 186 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 65 mm, with 160 mm OD and 37 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 89.3 mm and Ew 135.3 mm — the envelope inside the 65/160 mm bore/OD where the rollers actually run. Speed ratio check: limiting 3,600 r/min is .84 of the 4,300 r/min oil value for NUP413; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP413.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Open NUP413 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 65 mm contact.", "The 47.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "The 47.5 mm section at 65 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "The NUP rib arrangement is not interchangeable with another prefix on the same 65 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 160×37 mm envelope matches.", "The 202/186 kN ratings, 21.9 kN Pu and 3500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP413 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP413?", "a": "NUP413 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 65 mm bore, 160 mm OD and 37 mm width (2.559 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 202 kN, C0 186 kN, Pu 21.9 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP413 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP413 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP413 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP413?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89.3 mm, Ew 135.3 mm. The nominal bore/OD remain 65/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP413", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup413", "NUP413" ], "locale_variants": {} }, { "sku": "N1014", "brand": "NTN", "manufacturer_designation": "NTN N1014", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 8.6, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7600, "weight_g": 689, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1014 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 64.5 kN dynamic rating in the 70 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 70 mm (00–03 use the 10/12/15/17 exception table). With C 64.5 kN and C0 70.5 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Equivalent-load planning treats N1014 as a pure radial bearing: keep P below 64.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of N1014; an oversized radius locks the ring on its face and tilts the 20 mm-wide seat.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Open N1014 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1014 skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "The 64.5/70.5 kN ratings, 8.6 kN Pu and 689 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1014 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1014?", "a": "N1014 is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 110 mm OD and 20 mm width (2.756 × 4.331 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 70.5 kN, Pu 8.6 kN, grease limiting speed 6,500 r/min, oil 7,600 r/min, mass about 689 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1014 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1014 is supplied in the standard open execution shown in the table." }, { "q": "Can N1014 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1014?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 80 mm, Ew 100 mm. The nominal bore/OD remain 70/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1014", "N1014" ], "locale_variants": {} }, { "sku": "NJ1014", "brand": "NTN", "manufacturer_designation": "NTN NJ1014", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 8.6, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7600, "weight_g": 689, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies NJ1014: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 6,500 r/min on grease and 7,600 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1014 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. The 20.0 mm radial section ((110−70)/2) frames the roller complement; capacity per millimetre of bore is about 0.9 kN/mm before application factors. Selection arithmetic: Pu 8.6 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (70.5/64.5 kN) shows the high-static-capacity proportioning of this 70 mm bore. Heat the inner ring to max 120 °C for the 70 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The 20 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1014 skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "Do not replace NJ1014 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 20.0 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 20 mm-wide cavity.", "The 64.5/70.5 kN ratings, 8.6 kN Pu and 689 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1014 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1014?", "a": "NJ1014 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 110 mm OD and 20 mm width (2.756 × 4.331 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 70.5 kN, Pu 8.6 kN, grease limiting speed 6,500 r/min, oil 7,600 r/min, mass about 689 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1014 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1014 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1014 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1014?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 80 mm, Ew 100 mm. The nominal bore/OD remain 70/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1014", "NJ1014" ], "locale_variants": {} }, { "sku": "NN3014", "brand": "NTN", "manufacturer_designation": "NTN NN3014", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 105, "static_load_kN": 143, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 6800, "weight_g": 1040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3014 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 70×110×30 mm ISO 15 envelope. Numbering ties NN3014 to its envelope: type code NN, series NN3000, 70 mm bore; the 110×30 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 105 kN and C0 143 kN (C0/C ≈ 1.36) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The NN rib arrangement is not interchangeable with another prefix on the same 70 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 110×30 mm envelope matches.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3014 does not substitute a precision-class execution.", "The 30 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3014 skids at 5,800 r/min and fails by smearing long before L10 fatigue.", "The 105/143 kN ratings, 17.4 kN Pu and 1040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3014 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3014?", "a": "NN3014 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 70 mm bore, 110 mm OD and 30 mm width (2.756 × 4.331 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 105 kN, C0 143 kN, Pu 17.4 kN, grease limiting speed 5,800 r/min, oil 6,800 r/min, mass about 1040 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3014 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3014 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3014?", "a": "NN3014 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3014?", "a": "NTN rates NN3014 at 5,800 r/min with grease and 6,800 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3014", "NN3014" ], "locale_variants": {} }, { "sku": "NN3014K", "brand": "NTN", "manufacturer_designation": "NTN NN3014K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 105, "static_load_kN": 143, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 5800, "max_rpm": 5800, "speed_oil_rpm": 6800, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3014K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 70×110×30 mm ISO 15 envelope. Digit by digit, NN3014K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 30 mm width and 20.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 17.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.36 (143/105 kN) shows the high-static-capacity proportioning of this 70 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 70 mm shaft.", "applications": [ "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 105/143 kN pair here belongs to NN3014K as printed, not to the bare size.", "The K tapered bore of NN3014K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "The K tapered bore of NN3014K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "Open NN3014K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The 105/143 kN ratings, 17.4 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3014K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3014K?", "a": "NN3014K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 70 mm bore, 110 mm OD and 30 mm width (2.756 × 4.331 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 105 kN, C0 143 kN, Pu 17.4 kN, grease limiting speed 5,800 r/min, oil 6,800 r/min, mass about 1010 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3014K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3014K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3014K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3014K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3014 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3014K?", "a": "NTN rates NN3014K at 5,800 r/min with grease and 6,800 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3014K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3014k", "NN3014K" ], "locale_variants": {} }, { "sku": "NU1014", "brand": "NTN", "manufacturer_designation": "NTN NU1014", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 8.6, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7600, "weight_g": 689, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1014 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 70×110×20 mm ISO 15 envelope. Numbering ties NU1014 to its envelope: type code NU, series NU1000, 70 mm bore; the 110×20 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 7,600 r/min with oil versus 6,500 r/min with grease (a 1,100 r/min band), lubrication choice for NU1014 is a thermal decision, not just a sealing one. The 0.9 kN-per-mm-bore figure (64.5 kN over 70 mm) lets a NU1014 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Grease limiting speed 6,500 r/min and oil 7,600 r/min are different limits for NU1014: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 110 mm race brinells and releases as vibration within hours.", "Do not replace NU1014 with a deep-groove ball bearing on rating alone: line contact gives 64.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 6,500 r/min and oil 7,600 r/min are different limits for NU1014: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 64.5/70.5 kN ratings, 8.6 kN Pu and 689 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1014 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1014?", "a": "NU1014 is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 110 mm OD and 20 mm width (2.756 × 4.331 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 70.5 kN, Pu 8.6 kN, grease limiting speed 6,500 r/min, oil 7,600 r/min, mass about 689 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1014 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1014 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1014 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1014?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 80 mm, Ew 100 mm. The nominal bore/OD remain 70/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1014-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1014-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1014", "NU1014" ], "locale_variants": {} }, { "sku": "NUP1014", "brand": "NTN", "manufacturer_designation": "NTN NUP1014", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 8.6, "limiting_speed_rpm": 6500, "max_rpm": 6500, "speed_oil_rpm": 7600, "weight_g": 689, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1014 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 70×110×20 mm ISO 15 envelope. Numbering ties NUP1014 to its envelope: type code NUP, series NUP1000, 70 mm bore; the 110×20 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 64.5 kN and C0 70.5 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Thermal planning around the 6,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 7,600 r/min for continuously high-duty 70 mm positions. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 70 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 110 mm raceway.", "Grease limiting speed 6,500 r/min and oil 7,600 r/min are different limits for NUP1014: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1014 skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1014 skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1014 skids at 6,500 r/min and fails by smearing long before L10 fatigue.", "The 64.5/70.5 kN ratings, 8.6 kN Pu and 689 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1014 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1014?", "a": "NUP1014 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 110 mm OD and 20 mm width (2.756 × 4.331 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 70.5 kN, Pu 8.6 kN, grease limiting speed 6,500 r/min, oil 7,600 r/min, mass about 689 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1014 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1014 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1014 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1014?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 80 mm, Ew 100 mm. The nominal bore/OD remain 70/110 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,500 r/min grease / 7,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1014", "NUP1014" ], "locale_variants": {} }, { "sku": "N214", "brand": "NTN", "manufacturer_designation": "NTN N214", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 92.5, "static_load_kN": 95, "fatigue_load_limit_kN": 11.6, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N214 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 70×125×24 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 70 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 84.5 mm and Ew 110.5 mm — the envelope inside the 70/125 mm bore/OD where the rollers actually run. Speed ratio check: limiting 5,500 r/min is .85 of the 6,500 r/min oil value for N214; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 70 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Do not replace N214 with a deep-groove ball bearing on rating alone: line contact gives 92.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 92.5/95 kN pair here belongs to N214 as printed, not to the bare size.", "The N rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 125×24 mm envelope matches.", "The 92.5/95 kN ratings, 11.6 kN Pu and 1100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N214?", "a": "N214 is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 92.5 kN, C0 95 kN, Pu 11.6 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N214 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N214 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N214-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n214", "＊＊n214", "N214" ], "locale_variants": {} }, { "sku": "N214EA", "brand": "NTN", "manufacturer_designation": "NTN N214EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 140, "static_load_kN": 137, "fatigue_load_limit_kN": 16.7, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 7100, "weight_g": 1130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies N214EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 5,000 r/min on grease and 7,100 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 125 mm OD and 24 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Rating life at 140 kN C assumes clean oil and adequate film; the 16.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N214EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Open N214EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "If the shaft must be located both ways, do not use N214EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 5,000 r/min and oil 7,100 r/min are different limits for N214EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 140/137 kN pair here belongs to N214EA as printed, not to the bare size.", "The 140/137 kN ratings, 16.7 kN Pu and 1130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N214EA?", "a": "N214EA is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 140 kN, C0 137 kN, Pu 16.7 kN, grease limiting speed 5,000 r/min, oil 7,100 r/min, mass about 1130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N214EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N214EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n214ea", "＊n214ea", "N214EA" ], "locale_variants": {} }, { "sku": "N2214", "brand": "NTN", "manufacturer_designation": "NTN N2214", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 132, "static_load_kN": 151, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 5900, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2214 appears as a 70 mm bore single-row cylindrical roller bearing (132 kN C / 151 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 125 mm OD and 31 mm width from the ISO 15 general plan. The 31 mm width and 27.5 mm section put the N2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats N2214 as a pure radial bearing: keep P below 132 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 70 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "Open N2214 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2214 skids at 5,000 r/min and fails by smearing long before L10 fatigue.", "Open N2214 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The 132/151 kN ratings, 18.4 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2214?", "a": "N2214 is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 132 kN, C0 151 kN, Pu 18.4 kN, grease limiting speed 5,000 r/min, oil 5,900 r/min, mass about 1440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2214 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2214 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2214", "＊＊n2214", "N2214" ], "locale_variants": {} }, { "sku": "N2214EA", "brand": "NTN", "manufacturer_designation": "NTN N2214EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 194, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 6200, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2214EA appears as a 70 mm bore single-row cylindrical roller bearing (184 kN C / 194 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N2214EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 184 kN and C0 194 kN (C0/C ≈ 1.05) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Speed ratio check: limiting 4,500 r/min is .73 of the 6,200 r/min oil value for N2214EA; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2214EA.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2214EA skids at 4,500 r/min and fails by smearing long before L10 fatigue.", "Do not replace N2214EA with a deep-groove ball bearing on rating alone: line contact gives 184 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The N rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 125×31 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2214EA skids at 4,500 r/min and fails by smearing long before L10 fatigue.", "The 184/194 kN ratings, 23.7 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2214EA?", "a": "N2214EA is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 194 kN, Pu 23.7 kN, grease limiting speed 4,500 r/min, oil 6,200 r/min, mass about 1520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2214EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2214EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2214ea", "＊n2214ea", "N2214EA" ], "locale_variants": {} }, { "sku": "NF214", "brand": "NTN", "manufacturer_designation": "NTN NF214", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 92.5, "static_load_kN": 95, "fatigue_load_limit_kN": 11.6, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF214 is the standard section of the NTN NF200 dimension series for a 70 mm shaft — 92.5 kN of basic dynamic capacity in a 1100 g, open bearing. Numbering ties NF214 to its envelope: type code NF, series NF200, 70 mm bore; the 125×24 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 6,500 r/min with oil versus 5,500 r/min with grease (a 1,000 r/min band), lubrication choice for NF214 is a thermal decision, not just a sealing one. The 70 mm (2.756 in) bore and 125 mm (4.921 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 24 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NF214; an oversized radius locks the ring on its face and tilts the 24 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NF214 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Grease limiting speed 5,500 r/min and oil 6,500 r/min are different limits for NF214: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 92.5/95 kN ratings, 11.6 kN Pu and 1100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF214?", "a": "NF214 is an NTN NF single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 92.5 kN, C0 95 kN, Pu 11.6 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF214 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF214 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf214", "＊＊nf214", "NF214" ], "locale_variants": {} }, { "sku": "NF214EA", "brand": "NTN", "manufacturer_designation": "NTN NF214EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 140, "static_load_kN": 137, "fatigue_load_limit_kN": 16.7, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 7100, "weight_g": 1130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF214EA is the standard section of the NTN NF200 dimension series for a 70 mm shaft — 140 kN of basic dynamic capacity in a 1130 g, open bearing. Digit by digit, NF214EA reads as NF (one rib on each ring), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NF214EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 16.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.98 (137/140 kN) shows the high-static-capacity proportioning of this 70 mm bore. Heat the inner ring to max 120 °C for the 70 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Do not replace NF214EA with a deep-groove ball bearing on rating alone: line contact gives 140 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF214EA skids at 5,000 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 5,000 r/min and oil 7,100 r/min are different limits for NF214EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NF214EA with a deep-groove ball bearing on rating alone: line contact gives 140 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 140/137 kN ratings, 16.7 kN Pu and 1130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF214EA?", "a": "NF214EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 140 kN, C0 137 kN, Pu 16.7 kN, grease limiting speed 5,000 r/min, oil 7,100 r/min, mass about 1130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF214EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF214EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf214ea", "＊nf214ea", "NF214EA" ], "locale_variants": {} }, { "sku": "NF2214EA", "brand": "NTN", "manufacturer_designation": "NTN NF2214EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 194, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 6200, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2214EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 184 kN dynamic rating in the 70 mm bore. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF2214EA floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. With C 184 kN and C0 194 kN (C0/C ≈ 1.05) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Speed ratio check: limiting 4,500 r/min is .73 of the 6,200 r/min oil value for NF2214EA; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 70 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Do not replace NF2214EA with a deep-groove ball bearing on rating alone: line contact gives 184 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NF2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 27.5 mm section at 70 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2214EA skids at 4,500 r/min and fails by smearing long before L10 fatigue.", "The 184/194 kN ratings, 23.7 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2214EA?", "a": "NF2214EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 194 kN, Pu 23.7 kN, grease limiting speed 4,500 r/min, oil 6,200 r/min, mass about 1520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2214EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2214EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2214ea", "＊nf2214ea", "NF2214EA" ], "locale_variants": {} }, { "sku": "NJ214", "brand": "NTN", "manufacturer_designation": "NTN NJ214", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 92.5, "static_load_kN": 95, "fatigue_load_limit_kN": 11.6, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ214 on the 70×125 mm envelope, 24 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,500 r/min. Numbering ties NJ214 to its envelope: type code NJ, series NJ200, 70 mm bore; the 125×24 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 84.5 mm and Ew 110.5 mm — the envelope inside the 70/125 mm bore/OD where the rollers actually run. Speed ratio check: limiting 5,500 r/min is .85 of the 6,500 r/min oil value for NJ214; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ214.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Do not replace NJ214 with a deep-groove ball bearing on rating alone: line contact gives 92.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The NJ rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 125×24 mm envelope matches.", "The 92.5/95 kN ratings, 11.6 kN Pu and 1100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ214?", "a": "NJ214 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 92.5 kN, C0 95 kN, Pu 11.6 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ214 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ214 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ214-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj214", "＊＊nj214", "NJ214" ], "locale_variants": {} }, { "sku": "NJ214EA", "brand": "NTN", "manufacturer_designation": "NTN NJ214EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 140, "static_load_kN": 137, "fatigue_load_limit_kN": 16.7, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 7100, "weight_g": 1130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ214EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 140 kN dynamic rating in the 70 mm bore. Digit by digit, NJ214EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ214EA designation when purchasing. Rating life at 140 kN C assumes clean oil and adequate film; the 16.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ214EA.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Open NJ214EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Open NJ214EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Do not replace NJ214EA with a deep-groove ball bearing on rating alone: line contact gives 140 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The 140/137 kN ratings, 16.7 kN Pu and 1130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ214EA?", "a": "NJ214EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 140 kN, C0 137 kN, Pu 16.7 kN, grease limiting speed 5,000 r/min, oil 7,100 r/min, mass about 1130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ214EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ214EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj214ea", "＊nj214ea", "NJ214EA" ], "locale_variants": {} }, { "sku": "NJ2214", "brand": "NTN", "manufacturer_designation": "NTN NJ2214", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 132, "static_load_kN": 151, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 5900, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2214 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 132 kN dynamic rating in the 70 mm bore. Numbering ties NJ2214 to its envelope: type code NJ, series NJ2200, 70 mm bore; the 125×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 84.5 mm and Ew 110.5 mm — the envelope inside the 70/125 mm bore/OD where the rollers actually run. Mass 1440 g for the 70×125×31 mm NJ2214 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2214.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Grease limiting speed 5,000 r/min and oil 5,900 r/min are different limits for NJ2214: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NJ2214 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NJ2214 with a deep-groove ball bearing on rating alone: line contact gives 132 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 125×31 mm envelope matches.", "The 132/151 kN ratings, 18.4 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2214?", "a": "NJ2214 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 132 kN, C0 151 kN, Pu 18.4 kN, grease limiting speed 5,000 r/min, oil 5,900 r/min, mass about 1440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2214 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2214 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2214-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2214", "＊＊nj2214", "NJ2214" ], "locale_variants": {} }, { "sku": "NJ2214EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2214EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 194, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 6200, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2214EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 184 kN dynamic rating in the 70 mm bore. Numbering ties NJ2214EA to its envelope: type code NJ, series NJ2200, 70 mm bore; the 125×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 83.5 mm and Ew 113.5 mm — the envelope inside the 70/125 mm bore/OD where the rollers actually run. Mass 1520 g for the 70×125×31 mm NJ2214EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 4,500 r/min and oil 6,200 r/min are different limits for NJ2214EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NJ rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 125×31 mm envelope matches.", "The 184/194 kN ratings, 23.7 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2214EA?", "a": "NJ2214EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 194 kN, Pu 23.7 kN, grease limiting speed 4,500 r/min, oil 6,200 r/min, mass about 1520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2214EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2214EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2214ea", "＊nj2214ea", "NJ2214EA" ], "locale_variants": {} }, { "sku": "NU214-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU214", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 92.5, "static_load_kN": 95, "fatigue_load_limit_kN": 11.6, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU214 on the 70×125 mm envelope, 24 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,500 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU214 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU214. Selection arithmetic: Pu 11.6 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.03 (95/92.5 kN) shows the high-static-capacity proportioning of this 70 mm bore. Heat the inner ring to max 120 °C for the 70 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Do not replace NU214 with a deep-groove ball bearing on rating alone: line contact gives 92.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 5,500 r/min and oil 6,500 r/min are different limits for NU214: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NU214 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "The 92.5/95 kN ratings, 11.6 kN Pu and 1100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU214?", "a": "NU214 is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 92.5 kN, C0 95 kN, Pu 11.6 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU214 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU214 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu214", "＊＊nu214", "NU214", "NU214-NTN" ], "locale_variants": {} }, { "sku": "NU214EA", "brand": "NTN", "manufacturer_designation": "NTN NU214EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 140, "static_load_kN": 137, "fatigue_load_limit_kN": 16.7, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 7100, "weight_g": 1130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU214EA is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 70×125×24 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 125 mm OD and 24 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU214EA. Thermal planning around the 5,000 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 7,100 r/min for continuously high-duty 70 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU214EA skids at 5,000 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "The 140/137 kN ratings, 16.7 kN Pu and 1130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU214EA?", "a": "NU214EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 140 kN, C0 137 kN, Pu 16.7 kN, grease limiting speed 5,000 r/min, oil 7,100 r/min, mass about 1130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU214EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU214EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu214ea", "＊nu214ea", "NU214EA" ], "locale_variants": {} }, { "sku": "NU2214", "brand": "NTN", "manufacturer_designation": "NTN NU2214", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 132, "static_load_kN": 151, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 5900, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2214 on the 70×125 mm envelope, 31 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,000 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2214 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NU2214 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 18.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.14 (151/132 kN) shows the high-static-capacity proportioning of this 70 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "The 27.5 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Open NU2214 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 132/151 kN pair here belongs to NU2214 as printed, not to the bare size.", "Do not replace NU2214 with a deep-groove ball bearing on rating alone: line contact gives 132 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 132/151 kN ratings, 18.4 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2214?", "a": "NU2214 is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 132 kN, C0 151 kN, Pu 18.4 kN, grease limiting speed 5,000 r/min, oil 5,900 r/min, mass about 1440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2214 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2214 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2214-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2214", "＊＊nu2214", "NU2214" ], "locale_variants": {} }, { "sku": "NU2214EA", "brand": "NTN", "manufacturer_designation": "NTN NU2214EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 194, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 6200, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies NU2214EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,500 r/min on grease and 6,200 r/min on oil. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 70 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU2214EA designation when purchasing. Speed ratio check: limiting 4,500 r/min is .73 of the 6,200 r/min oil value for NU2214EA; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2214EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2214EA skids at 4,500 r/min and fails by smearing long before L10 fatigue.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2214EA skids at 4,500 r/min and fails by smearing long before L10 fatigue.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The 184/194 kN ratings, 23.7 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2214EA?", "a": "NU2214EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 194 kN, Pu 23.7 kN, grease limiting speed 4,500 r/min, oil 6,200 r/min, mass about 1520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2214EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2214EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2214ea", "＊nu2214ea", "NU2214EA" ], "locale_variants": {} }, { "sku": "NUP214", "brand": "NTN", "manufacturer_designation": "NTN NUP214", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 92.5, "static_load_kN": 95, "fatigue_load_limit_kN": 11.6, "limiting_speed_rpm": 5500, "max_rpm": 5500, "speed_oil_rpm": 6500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP214 is the standard section of the NTN NUP200 dimension series for a 70 mm shaft — 92.5 kN of basic dynamic capacity in a 1100 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 125 mm OD and 24 mm width from the ISO 15 general plan. The 27.5 mm radial section ((125−70)/2) frames the roller complement; capacity per millimetre of bore is about 1.3 kN/mm before application factors. The 70 mm (2.756 in) bore and 125 mm (4.921 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 24 mm-wide ring. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 70 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 92.5/95 kN pair here belongs to NUP214 as printed, not to the bare size.", "The 27.5 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 24 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP214 skids at 5,500 r/min and fails by smearing long before L10 fatigue.", "The 27.5 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 24 mm-wide cavity.", "The 92.5/95 kN ratings, 11.6 kN Pu and 1100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP214?", "a": "NUP214 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 92.5 kN, C0 95 kN, Pu 11.6 kN, grease limiting speed 5,500 r/min, oil 6,500 r/min, mass about 1100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP214 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP214 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,500 r/min grease / 6,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP214-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup214", "＊＊nup214", "NUP214" ], "locale_variants": {} }, { "sku": "NUP214EA", "brand": "NTN", "manufacturer_designation": "NTN NUP214EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 140, "static_load_kN": 137, "fatigue_load_limit_kN": 16.7, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 7100, "weight_g": 1130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP214EA denotes a 70×125×24 mm (2.756 × 4.921 × 0.945 in) cylindrical roller bearing in the NUP200 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP214EA floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. At 7,100 r/min with oil versus 5,000 r/min with grease (a 2,100 r/min band), lubrication choice for NUP214EA is a thermal decision, not just a sealing one. Mass 1130 g for the 70×125×24 mm NUP214EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP214EA; an oversized radius locks the ring on its face and tilts the 24 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "If the shaft must be located both ways, do not use NUP214EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NUP214EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Grease limiting speed 5,000 r/min and oil 7,100 r/min are different limits for NUP214EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 140/137 kN ratings, 16.7 kN Pu and 1130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP214EA?", "a": "NUP214EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 24 mm width (2.756 × 4.921 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 140 kN, C0 137 kN, Pu 16.7 kN, grease limiting speed 5,000 r/min, oil 7,100 r/min, mass about 1130 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP214EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP214EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup214ea", "＊nup214ea", "NUP214EA" ], "locale_variants": {} }, { "sku": "NUP2214", "brand": "NTN", "manufacturer_designation": "NTN NUP2214", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 132, "static_load_kN": 151, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 5000, "max_rpm": 5000, "speed_oil_rpm": 5900, "weight_g": 1440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies NUP2214: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,000 r/min on grease and 5,900 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2214 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. With C 132 kN and C0 151 kN (C0/C ≈ 1.14) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 70 mm (2.756 in) bore and 125 mm (4.921 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 31 mm-wide ring. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "The 27.5 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 132/151 kN pair here belongs to NUP2214 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NUP2214 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2214 skids at 5,000 r/min and fails by smearing long before L10 fatigue.", "The 132/151 kN ratings, 18.4 kN Pu and 1440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2214 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2214?", "a": "NUP2214 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 132 kN, C0 151 kN, Pu 18.4 kN, grease limiting speed 5,000 r/min, oil 5,900 r/min, mass about 1440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2214 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2214 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2214 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2214?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 84.5 mm, Ew 110.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,000 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2214-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2214", "＊＊nup2214", "NUP2214" ], "locale_variants": {} }, { "sku": "NUP2214EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2214EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 194, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 6200, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2214EA denotes a 70×125×31 mm (2.756 × 4.921 × 1.22 in) cylindrical roller bearing in the NUP2200 family, the EA high-capacity pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 125 mm OD and 31 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 23.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.05 (194/184 kN) shows the high-static-capacity proportioning of this 70 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2214EA.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 184/194 kN pair here belongs to NUP2214EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 184/194 kN pair here belongs to NUP2214EA as printed, not to the bare size.", "The 184/194 kN ratings, 23.7 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2214EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2214EA?", "a": "NUP2214EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 194 kN, Pu 23.7 kN, grease limiting speed 4,500 r/min, oil 6,200 r/min, mass about 1520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2214EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2214EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2214EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 83.5 mm, Ew 113.5 mm. The nominal bore/OD remain 70/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 6,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2214EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2214ea", "＊nup2214ea", "NUP2214EA" ], "locale_variants": {} }, { "sku": "N2314", "brand": "NTN", "manufacturer_designation": "NTN N2314", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 247, "static_load_kN": 262, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2314 is the extra-wide (23) section of the NTN N2300 dimension series for a 70 mm shaft — 247 kN of basic dynamic capacity in a 3900 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N2314 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N2314. Rating life at 247 kN C assumes clean oil and adequate film; the 31 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 70 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2314 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2314 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use N2314 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "The 247/262 kN ratings, 31 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2314?", "a": "N2314 is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 247 kN, C0 262 kN, Pu 31 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3900 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2314 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2314 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2314", "＊＊n2314", "N2314" ], "locale_variants": {} }, { "sku": "N2314EA", "brand": "NTN", "manufacturer_designation": "NTN N2314EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 325, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 5300, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2314EA on the 70×150 mm envelope, 51 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,800 r/min. Numbering ties N2314EA to its envelope: type code N, series N2300, 70 mm bore; the 150×51 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 51 mm width and 40.0 mm section put the N2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2314EA.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 325/325 kN pair here belongs to N2314EA as printed, not to the bare size.", "Open N2314EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2314EA skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "Open N2314EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The 325/325 kN ratings, 38 kN Pu and 3950 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2314EA?", "a": "N2314EA is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 325 kN, Pu 38 kN, grease limiting speed 3,800 r/min, oil 5,300 r/min, mass about 3950 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2314EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2314EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2314ea", "＊n2314ea", "N2314EA" ], "locale_variants": {} }, { "sku": "N314", "brand": "NTN", "manufacturer_designation": "NTN N314", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 175, "static_load_kN": 168, "fatigue_load_limit_kN": 20, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N314 on the 70×150 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,700 r/min. Digit by digit, N314 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 5,500 r/min with oil versus 4,700 r/min with grease (a 800 r/min band), lubrication choice for N314 is a thermal decision, not just a sealing one. Equivalent-load planning treats N314 as a pure radial bearing: keep P below 175 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N314.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Open N314 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Grease limiting speed 4,700 r/min and oil 5,500 r/min are different limits for N314: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 175/168 kN ratings, 20 kN Pu and 2650 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N314?", "a": "N314 is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 175 kN, C0 168 kN, Pu 20 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 2650 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N314 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N314 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N314-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n314", "＊＊n314", "N314" ], "locale_variants": {} }, { "sku": "N314EA", "brand": "NTN", "manufacturer_designation": "NTN N314EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 242, "static_load_kN": 222, "fatigue_load_limit_kN": 26.2, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 6000, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N314EA denotes a 70×150×35 mm (2.756 × 5.906 × 1.378 in) cylindrical roller bearing in the N300 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N314EA floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 4,200 r/min grease and 6,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 70 mm bore. The 70 mm (2.756 in) bore and 150 mm (5.906 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 35 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N314EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "If the shaft must be located both ways, do not use N314EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace N314EA with a deep-groove ball bearing on rating alone: line contact gives 242 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 242/222 kN pair here belongs to N314EA as printed, not to the bare size.", "If the shaft must be located both ways, do not use N314EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 242/222 kN ratings, 26.2 kN Pu and 2750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N314EA?", "a": "N314EA is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 242 kN, C0 222 kN, Pu 26.2 kN, grease limiting speed 4,200 r/min, oil 6,000 r/min, mass about 2750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N314EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N314EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n314ea", "＊n314ea", "N314EA" ], "locale_variants": {} }, { "sku": "NF2314EA", "brand": "NTN", "manufacturer_designation": "NTN NF2314EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 325, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 5300, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF2314EA denotes a 70×150×51 mm (2.756 × 5.906 × 2.008 in) cylindrical roller bearing in the NF2300 family, the EA high-capacity pressed sheet-steel cage. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 70 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NF2314EA designation when purchasing. The 4.6 kN-per-mm-bore figure (325 kN over 70 mm) lets a NF2314EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 51 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The 51 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2314EA skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "The 51 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The 325/325 kN ratings, 38 kN Pu and 3950 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2314EA?", "a": "NF2314EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 325 kN, Pu 38 kN, grease limiting speed 3,800 r/min, oil 5,300 r/min, mass about 3950 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2314EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2314EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2314ea", "＊nf2314ea", "NF2314EA" ], "locale_variants": {} }, { "sku": "NF314", "brand": "NTN", "manufacturer_designation": "NTN NF314", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 175, "static_load_kN": 168, "fatigue_load_limit_kN": 20, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF314 denotes a 70×150×35 mm (2.756 × 5.906 × 1.378 in) cylindrical roller bearing in the NF300 family, a pressed sheet-steel cage. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 150 mm OD and 35 mm width from the ISO 15 general plan. The 40.0 mm radial section ((150−70)/2) frames the roller complement; capacity per millimetre of bore is about 2.5 kN/mm before application factors. Rating life at 175 kN C assumes clean oil and adequate film; the 20 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 70 mm shaft.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Do not replace NF314 with a deep-groove ball bearing on rating alone: line contact gives 175 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NF rib arrangement is not interchangeable with another prefix on the same 70 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 150×35 mm envelope matches.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The 40.0 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 35 mm-wide cavity.", "The 175/168 kN ratings, 20 kN Pu and 2650 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF314?", "a": "NF314 is an NTN NF single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 175 kN, C0 168 kN, Pu 20 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 2650 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF314 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF314 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf314", "＊＊nf314", "NF314" ], "locale_variants": {} }, { "sku": "NF314EA", "brand": "NTN", "manufacturer_designation": "NTN NF314EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 242, "static_load_kN": 222, "fatigue_load_limit_kN": 26.2, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 6000, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF314EA on the 70×150 mm envelope, 35 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,200 r/min. Numbering ties NF314EA to its envelope: type code NF, series NF300, 70 mm bore; the 150×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 35 mm width and 40.0 mm section put the NF300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 4,200 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 6,000 r/min for continuously high-duty 70 mm positions. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 242/222 kN pair here belongs to NF314EA as printed, not to the bare size.", "Open NF314EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The 242/222 kN ratings, 26.2 kN Pu and 2750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF314EA?", "a": "NF314EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 242 kN, C0 222 kN, Pu 26.2 kN, grease limiting speed 4,200 r/min, oil 6,000 r/min, mass about 2750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF314EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF314EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf314ea", "＊nf314ea", "NF314EA" ], "locale_variants": {} }, { "sku": "NJ2314", "brand": "NTN", "manufacturer_designation": "NTN NJ2314", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 247, "static_load_kN": 262, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2314 appears as a 70 mm bore single-row cylindrical roller bearing (247 kN C / 262 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2314 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. At 4,800 r/min with oil versus 4,100 r/min with grease (a 700 r/min band), lubrication choice for NJ2314 is a thermal decision, not just a sealing one. Speed ratio check: limiting 4,100 r/min is .85 of the 4,800 r/min oil value for NJ2314; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Open NJ2314 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 247/262 kN pair here belongs to NJ2314 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NJ2314: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 247/262 kN ratings, 31 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2314?", "a": "NJ2314 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 247 kN, C0 262 kN, Pu 31 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3900 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2314 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2314 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2314-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2314", "＊＊nj2314", "NJ2314" ], "locale_variants": {} }, { "sku": "NJ2314EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2314EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 325, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 5300, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2314EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 70×150×51 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 150 mm OD and 51 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NJ2314EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 38 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.00 (325/325 kN) shows the high-static-capacity proportioning of this 70 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2314EA skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "The 40.0 mm section at 70 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 51 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 325/325 kN pair here belongs to NJ2314EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 325/325 kN ratings, 38 kN Pu and 3950 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2314EA?", "a": "NJ2314EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 325 kN, Pu 38 kN, grease limiting speed 3,800 r/min, oil 5,300 r/min, mass about 3950 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2314EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2314EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2314ea", "＊nj2314ea", "NJ2314EA" ], "locale_variants": {} }, { "sku": "NJ314", "brand": "NTN", "manufacturer_designation": "NTN NJ314", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 175, "static_load_kN": 168, "fatigue_load_limit_kN": 20, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies NJ314: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 4,700 r/min on grease and 5,500 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ314 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. The 40.0 mm radial section ((150−70)/2) frames the roller complement; capacity per millimetre of bore is about 2.5 kN/mm before application factors. Thermal planning around the 4,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,500 r/min for continuously high-duty 70 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ314.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Grease limiting speed 4,700 r/min and oil 5,500 r/min are different limits for NJ314: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 4,700 r/min and oil 5,500 r/min are different limits for NJ314: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 40.0 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 35 mm-wide cavity.", "The 175/168 kN ratings, 20 kN Pu and 2650 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ314?", "a": "NJ314 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 175 kN, C0 168 kN, Pu 20 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 2650 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ314 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ314 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ314-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj314", "＊＊nj314", "NJ314" ], "locale_variants": {} }, { "sku": "NJ314EA", "brand": "NTN", "manufacturer_designation": "NTN NJ314EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 242, "static_load_kN": 222, "fatigue_load_limit_kN": 26.2, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 6000, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ314EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 70×150×35 mm ISO 15 envelope. Numbering ties NJ314EA to its envelope: type code NJ, series NJ300, 70 mm bore; the 150×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 70 mm (2.756 in) bore and 150 mm (5.906 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 35 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ314EA.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "If the shaft must be located both ways, do not use NJ314EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NJ314EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 242/222 kN pair here belongs to NJ314EA as printed, not to the bare size.", "The 242/222 kN ratings, 26.2 kN Pu and 2750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ314EA?", "a": "NJ314EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 242 kN, C0 222 kN, Pu 26.2 kN, grease limiting speed 4,200 r/min, oil 6,000 r/min, mass about 2750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ314EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ314EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj314ea", "＊nj314ea", "NJ314EA" ], "locale_variants": {} }, { "sku": "NU2314", "brand": "NTN", "manufacturer_designation": "NTN NU2314", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 247, "static_load_kN": 262, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies NU2314: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,100 r/min on grease and 4,800 r/min on oil. Digit by digit, NU2314 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 90 mm and Ew 130 mm — the envelope inside the 70/150 mm bore/OD where the rollers actually run. Speed ratio check: limiting 4,100 r/min is .85 of the 4,800 r/min oil value for NU2314; grease-churn heating closes that gap as fill quantity rises. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "If the shaft must be located both ways, do not use NU2314 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2314 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "The NU rib arrangement is not interchangeable with another prefix on the same 70 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 150×51 mm envelope matches.", "The 247/262 kN ratings, 31 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2314?", "a": "NU2314 is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 247 kN, C0 262 kN, Pu 31 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3900 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2314 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2314 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2314-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2314", "＊＊nu2314", "NU2314" ], "locale_variants": {} }, { "sku": "NU2314EA", "brand": "NTN", "manufacturer_designation": "NTN NU2314EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 325, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 5300, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2314EA is the extra-wide (23) section of the NTN NU2300 dimension series for a 70 mm shaft — 325 kN of basic dynamic capacity in a 3950 g, open bearing. Digit by digit, NU2314EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,800 r/min grease and 5,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 70 mm bore. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Heat the inner ring to max 120 °C for the 70 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 325/325 kN pair here belongs to NU2314EA as printed, not to the bare size.", "Grease limiting speed 3,800 r/min and oil 5,300 r/min are different limits for NU2314EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 3,800 r/min and oil 5,300 r/min are different limits for NU2314EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NU2314EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 325/325 kN ratings, 38 kN Pu and 3950 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2314EA?", "a": "NU2314EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 325 kN, Pu 38 kN, grease limiting speed 3,800 r/min, oil 5,300 r/min, mass about 3950 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2314EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2314EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2314ea", "＊nu2314ea", "NU2314EA" ], "locale_variants": {} }, { "sku": "NU314-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU314", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 175, "static_load_kN": 168, "fatigue_load_limit_kN": 20, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU314 appears as a 70 mm bore single-row cylindrical roller bearing (175 kN C / 168 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU314 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NU314 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 2.5 kN-per-mm-bore figure (175 kN over 70 mm) lets a NU314 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Grease limiting speed 4,700 r/min and oil 5,500 r/min are different limits for NU314: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 175/168 kN ratings, 20 kN Pu and 2650 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU314?", "a": "NU314 is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 175 kN, C0 168 kN, Pu 20 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 2650 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU314 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU314 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu314", "＊＊nu314", "NU314", "NU314-NTN" ], "locale_variants": {} }, { "sku": "NU314EA", "brand": "NTN", "manufacturer_designation": "NTN NU314EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 242, "static_load_kN": 222, "fatigue_load_limit_kN": 26.2, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 6000, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU314EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 242 kN dynamic rating in the 70 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU314EA floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU314EA designation when purchasing. Rating life at 242 kN C assumes clean oil and adequate film; the 26.2 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU314EA.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Do not replace NU314EA with a deep-groove ball bearing on rating alone: line contact gives 242 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 242/222 kN pair here belongs to NU314EA as printed, not to the bare size.", "Grease limiting speed 4,200 r/min and oil 6,000 r/min are different limits for NU314EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The 242/222 kN ratings, 26.2 kN Pu and 2750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU314EA?", "a": "NU314EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 242 kN, C0 222 kN, Pu 26.2 kN, grease limiting speed 4,200 r/min, oil 6,000 r/min, mass about 2750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU314EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU314EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu314ea", "＊nu314ea", "NU314EA" ], "locale_variants": {} }, { "sku": "NUP2314", "brand": "NTN", "manufacturer_designation": "NTN NUP2314", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 247, "static_load_kN": 262, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2314 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 247 kN dynamic rating in the 70 mm bore. Digit by digit, NUP2314 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NUP2314 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 3900 g for the 70×150×51 mm NUP2314 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "If the shaft must be located both ways, do not use NUP2314 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 51 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The 40.0 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 51 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 247/262 kN ratings, 31 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2314?", "a": "NUP2314 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 247 kN, C0 262 kN, Pu 31 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3900 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2314 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2314 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2314-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2314", "＊＊nup2314", "NUP2314" ], "locale_variants": {} }, { "sku": "NUP2314EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2314EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 325, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 5300, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies NUP2314EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,800 r/min on grease and 5,300 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 70 mm (00–03 use the 10/12/15/17 exception table). At 5,300 r/min with oil versus 3,800 r/min with grease (a 1,500 r/min band), lubrication choice for NUP2314EA is a thermal decision, not just a sealing one. Mass 3950 g for the 70×150×51 mm NUP2314EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP2314EA; an oversized radius locks the ring on its face and tilts the 51 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Do not replace NUP2314EA with a deep-groove ball bearing on rating alone: line contact gives 325 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 325/325 kN pair here belongs to NUP2314EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Grease limiting speed 3,800 r/min and oil 5,300 r/min are different limits for NUP2314EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 325/325 kN ratings, 38 kN Pu and 3950 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2314EA?", "a": "NUP2314EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 325 kN, Pu 38 kN, grease limiting speed 3,800 r/min, oil 5,300 r/min, mass about 3950 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2314EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2314EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2314ea", "＊nup2314ea", "NUP2314EA" ], "locale_variants": {} }, { "sku": "NUP314", "brand": "NTN", "manufacturer_designation": "NTN NUP314", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 175, "static_load_kN": 168, "fatigue_load_limit_kN": 20, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP314 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 70×150×35 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 70 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 2650 g for the 70×150×35 mm NUP314 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Do not replace NUP314 with a deep-groove ball bearing on rating alone: line contact gives 175 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NUP314 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 175/168 kN pair here belongs to NUP314 as printed, not to the bare size.", "The 175/168 kN ratings, 20 kN Pu and 2650 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP314 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP314?", "a": "NUP314 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 175 kN, C0 168 kN, Pu 20 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 2650 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP314 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP314 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP314 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP314?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 90 mm, Ew 130 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP314-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup314", "＊＊nup314", "NUP314" ], "locale_variants": {} }, { "sku": "NUP314EA", "brand": "NTN", "manufacturer_designation": "NTN NUP314EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 242, "static_load_kN": 222, "fatigue_load_limit_kN": 26.2, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 6000, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies NUP314EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 4,200 r/min on grease and 6,000 r/min on oil. Digit by digit, NUP314EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 242 kN and C0 222 kN (C0/C ≈ 0.92) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 3.5 kN-per-mm-bore figure (242 kN over 70 mm) lets a NUP314EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP314EA skids at 4,200 r/min and fails by smearing long before L10 fatigue.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "Do not replace NUP314EA with a deep-groove ball bearing on rating alone: line contact gives 242 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP314EA skids at 4,200 r/min and fails by smearing long before L10 fatigue.", "The 242/222 kN ratings, 26.2 kN Pu and 2750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP314EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP314EA?", "a": "NUP314EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 242 kN, C0 222 kN, Pu 26.2 kN, grease limiting speed 4,200 r/min, oil 6,000 r/min, mass about 2750 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP314EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP314EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP314EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 89 mm, Ew 133 mm. The nominal bore/OD remain 70/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP314EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup314ea", "＊nup314ea", "NUP314EA" ], "locale_variants": {} }, { "sku": "N414", "brand": "NTN", "manufacturer_designation": "NTN N414", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 253, "static_load_kN": 236, "fatigue_load_limit_kN": 26.8, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 70 mm shaft NTN supplies N414: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 3,400 r/min on grease and 4,000 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 70 mm, with 180 mm OD and 42 mm width from the ISO 15 general plan. The 42 mm width and 55.0 mm section put the N400 series in the heavy (04) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 26.8 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.93 (236/253 kN) shows the high-static-capacity proportioning of this 70 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N414.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for N414: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The N rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 180×42 mm envelope matches.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for N414: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open N414 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The 253/236 kN ratings, 26.8 kN Pu and 5100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N414 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N414?", "a": "N414 is an NTN N single-row cylindrical roller bearing to ISO 15: 70 mm bore, 180 mm OD and 42 mm width (2.756 × 7.087 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 253 kN, C0 236 kN, Pu 26.8 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N414 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N414 is supplied in the standard open execution shown in the table." }, { "q": "Can N414 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N414?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100 mm, Ew 152 mm. The nominal bore/OD remain 70/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N414", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n414", "N414" ], "locale_variants": {} }, { "sku": "NF414", "brand": "NTN", "manufacturer_designation": "NTN NF414", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 253, "static_load_kN": 236, "fatigue_load_limit_kN": 26.8, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF414 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 70×180×42 mm ISO 15 envelope. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 70 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 3,400 r/min grease and 4,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 70 mm bore. The 3.6 kN-per-mm-bore figure (253 kN over 70 mm) lets a NF414 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 70 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The NF rib arrangement is not interchangeable with another prefix on the same 70 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 180×42 mm envelope matches.", "Open NF414 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NF400 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NF414 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 253/236 kN ratings, 26.8 kN Pu and 5100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF414 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF414?", "a": "NF414 is an NTN NF single-row cylindrical roller bearing to ISO 15: 70 mm bore, 180 mm OD and 42 mm width (2.756 × 7.087 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 253 kN, C0 236 kN, Pu 26.8 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF414 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF414 is supplied in the standard open execution shown in the table." }, { "q": "Can NF414 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF414?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100 mm, Ew 152 mm. The nominal bore/OD remain 70/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF414", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf414", "NF414" ], "locale_variants": {} }, { "sku": "NJ414", "brand": "NTN", "manufacturer_designation": "NTN NJ414", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 253, "static_load_kN": 236, "fatigue_load_limit_kN": 26.8, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ414 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 253 kN dynamic rating in the 70 mm bore. Digit by digit, NJ414 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 42 mm width and 55.0 mm section put the NJ400 series in the heavy (04) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 3.6 kN-per-mm-bore figure (253 kN over 70 mm) lets a NJ414 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 70 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Open NJ414 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "If the shaft must be located both ways, do not use NJ414 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NJ414 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NJ414 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "The 253/236 kN ratings, 26.8 kN Pu and 5100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ414 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ414?", "a": "NJ414 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 70 mm bore, 180 mm OD and 42 mm width (2.756 × 7.087 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 253 kN, C0 236 kN, Pu 26.8 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ414 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ414 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ414 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ414?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100 mm, Ew 152 mm. The nominal bore/OD remain 70/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ414-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj414", "NJ414" ], "locale_variants": {} }, { "sku": "NU414", "brand": "NTN", "manufacturer_designation": "NTN NU414", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 253, "static_load_kN": 236, "fatigue_load_limit_kN": 26.8, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU414 denotes a 70×180×42 mm (2.756 × 7.087 × 1.654 in) cylindrical roller bearing in the NU400 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU414 floats or locates; the numeric remainder is the ISO 15 series and 70 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU414 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 26.8 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.93 (236/253 kN) shows the high-static-capacity proportioning of this 70 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU414.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The 55.0 mm section at 70 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.", "If the shaft must be located both ways, do not use NU414 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU414 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 70 mm contact.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 253/236 kN ratings, 26.8 kN Pu and 5100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU414 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU414?", "a": "NU414 is an NTN NU single-row cylindrical roller bearing to ISO 15: 70 mm bore, 180 mm OD and 42 mm width (2.756 × 7.087 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 253 kN, C0 236 kN, Pu 26.8 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU414 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU414 is supplied in the standard open execution shown in the table." }, { "q": "Can NU414 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU414?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100 mm, Ew 152 mm. The nominal bore/OD remain 70/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU414-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu414", "NU414" ], "locale_variants": {} }, { "sku": "NUP414", "brand": "NTN", "manufacturer_designation": "NTN NUP414", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 253, "static_load_kN": 236, "fatigue_load_limit_kN": 26.8, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP414 on the 70×180 mm envelope, 42 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. Digit by digit, NUP414 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 70 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NUP414 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 3.6 kN-per-mm-bore figure (253 kN over 70 mm) lets a NUP414 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP414 non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 70 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The 42 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 70 mm inner ring.", "The NUP rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 180×42 mm envelope matches.", "The NUP rib arrangement is not interchangeable with another prefix on the same 70 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 180×42 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 70 mm bore share bore but not OD/width; check the full NUP400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 253/236 kN ratings, 26.8 kN Pu and 5100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP414 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP414?", "a": "NUP414 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 70 mm bore, 180 mm OD and 42 mm width (2.756 × 7.087 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 253 kN, C0 236 kN, Pu 26.8 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP414 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP414 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP414 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP414?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100 mm, Ew 152 mm. The nominal bore/OD remain 70/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP414", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup414", "NUP414" ], "locale_variants": {} }, { "sku": "N1015", "brand": "NTN", "manufacturer_designation": "NTN N1015", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 74.5, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 6100, "max_rpm": 6100, "speed_oil_rpm": 7100, "weight_g": 727, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1015 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 75×115×20 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 115 mm OD and 20 mm width from the ISO 15 general plan. The 20 mm width and 20.0 mm section put the N1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Heat the inner ring to max 120 °C for the 75 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 115 mm raceway.", "The 20 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Open N1015 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1015 skids at 6,100 r/min and fails by smearing long before L10 fatigue.", "Open N1015 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The 66.5/74.5 kN ratings, 9.1 kN Pu and 727 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1015 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1015?", "a": "N1015 is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 115 mm OD and 20 mm width (2.953 × 4.528 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66.5 kN, C0 74.5 kN, Pu 9.1 kN, grease limiting speed 6,100 r/min, oil 7,100 r/min, mass about 727 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1015 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1015 is supplied in the standard open execution shown in the table." }, { "q": "Can N1015 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1015?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 85 mm, Ew 105 mm. The nominal bore/OD remain 75/115 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,100 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1015", "N1015" ], "locale_variants": {} }, { "sku": "NJ1015", "brand": "NTN", "manufacturer_designation": "NTN NJ1015", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 74.5, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 6100, "max_rpm": 6100, "speed_oil_rpm": 7100, "weight_g": 727, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ1015 denotes a 75×115×20 mm (2.953 × 4.528 × 0.787 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. Numbering ties NJ1015 to its envelope: type code NJ, series NJ1000, 75 mm bore; the 115×20 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ1015 designation when purchasing. Rating life at 66.5 kN C assumes clean oil and adequate film; the 9.1 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 115 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1015 skids at 6,100 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NJ1015 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 66.5/74.5 kN pair here belongs to NJ1015 as printed, not to the bare size.", "The 20 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 66.5/74.5 kN ratings, 9.1 kN Pu and 727 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1015 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1015?", "a": "NJ1015 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 115 mm OD and 20 mm width (2.953 × 4.528 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66.5 kN, C0 74.5 kN, Pu 9.1 kN, grease limiting speed 6,100 r/min, oil 7,100 r/min, mass about 727 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1015 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1015 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1015 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1015?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 85 mm, Ew 105 mm. The nominal bore/OD remain 75/115 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,100 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1015", "NJ1015" ], "locale_variants": {} }, { "sku": "NN3015", "brand": "NTN", "manufacturer_designation": "NTN NN3015", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 149, "fatigue_load_limit_kN": 18.2, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3015 appears as a 75 mm bore single-row cylindrical roller bearing (107 kN C / 149 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). The 30 mm width and 20.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 1140 g for the 75×115×30 mm NN3015 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 115 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 107/149 kN pair here belongs to NN3015 as printed, not to the bare size.", "The 20.0 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 30 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NN3015 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The 107/149 kN ratings, 18.2 kN Pu and 1140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3015 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3015?", "a": "NN3015 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 75 mm bore, 115 mm OD and 30 mm width (2.953 × 4.528 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 149 kN, Pu 18.2 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1140 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3015 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3015 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3015?", "a": "NN3015 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3015?", "a": "NTN rates NN3015 at 5,400 r/min with grease and 6,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3015", "NN3015" ], "locale_variants": {} }, { "sku": "NN3015K", "brand": "NTN", "manufacturer_designation": "NTN NN3015K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 149, "fatigue_load_limit_kN": 18.2, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3015K is the standard section of the NTN NN3000 dimension series for a 75 mm shaft — 107 kN of basic dynamic capacity in a 1110 g, open bearing. Numbering ties NN3015K to its envelope: type code NN, series NN3000, 75 mm bore; the 115×30 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NN3015K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 1110 g for the 75×115×30 mm NN3015K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 115 mm raceway.", "The 20.0 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 30 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3015K skids at 5,400 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 107/149 kN ratings, 18.2 kN Pu and 1110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3015K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3015K?", "a": "NN3015K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 75 mm bore, 115 mm OD and 30 mm width (2.953 × 4.528 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 149 kN, Pu 18.2 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1110 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3015K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3015K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3015K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3015K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3015 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3015K?", "a": "NTN rates NN3015K at 5,400 r/min with grease and 6,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3015K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3015k", "NN3015K" ], "locale_variants": {} }, { "sku": "NU1015", "brand": "NTN", "manufacturer_designation": "NTN NU1015", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 74.5, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 6100, "max_rpm": 6100, "speed_oil_rpm": 7100, "weight_g": 727, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1015 appears as a 75 mm bore single-row cylindrical roller bearing (66.5 kN C / 74.5 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU1015 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 9.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.12 (74.5/66.5 kN) shows the high-static-capacity proportioning of this 75 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 115 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NU1015 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 66.5/74.5 kN pair here belongs to NU1015 as printed, not to the bare size.", "Do not replace NU1015 with a deep-groove ball bearing on rating alone: line contact gives 66.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 66.5/74.5 kN ratings, 9.1 kN Pu and 727 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1015 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1015?", "a": "NU1015 is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 115 mm OD and 20 mm width (2.953 × 4.528 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66.5 kN, C0 74.5 kN, Pu 9.1 kN, grease limiting speed 6,100 r/min, oil 7,100 r/min, mass about 727 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1015 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1015 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1015 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1015?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 85 mm, Ew 105 mm. The nominal bore/OD remain 75/115 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,100 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1015-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1015", "NU1015" ], "locale_variants": {} }, { "sku": "NUP1015", "brand": "NTN", "manufacturer_designation": "NTN NUP1015", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 74.5, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 6100, "max_rpm": 6100, "speed_oil_rpm": 7100, "weight_g": 727, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1015 appears as a 75 mm bore single-row cylindrical roller bearing (66.5 kN C / 74.5 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). The 20 mm width and 20.0 mm section put the NUP1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 75 mm (2.953 in) bore and 115 mm (4.528 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 20 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1015.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 115 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NUP1015 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NUP1015 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NUP1015 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The 66.5/74.5 kN ratings, 9.1 kN Pu and 727 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1015 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1015?", "a": "NUP1015 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 115 mm OD and 20 mm width (2.953 × 4.528 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 66.5 kN, C0 74.5 kN, Pu 9.1 kN, grease limiting speed 6,100 r/min, oil 7,100 r/min, mass about 727 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1015 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1015 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1015 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1015?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 85 mm, Ew 105 mm. The nominal bore/OD remain 75/115 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,100 r/min grease / 7,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1015", "NUP1015" ], "locale_variants": {} }, { "sku": "N215", "brand": "NTN", "manufacturer_designation": "NTN N215", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 111, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N215 appears as a 75 mm bore single-row cylindrical roller bearing (107 kN C / 111 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 130 mm OD and 25 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives N215 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 1.4 kN-per-mm-bore figure (107 kN over 75 mm) lets a N215 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Open N215 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 107/111 kN ratings, 13.4 kN Pu and 1210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N215?", "a": "N215 is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 111 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N215 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N215 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N215-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n215", "＊＊n215", "N215" ], "locale_variants": {} }, { "sku": "N215EA", "brand": "NTN", "manufacturer_designation": "NTN N215EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 154, "static_load_kN": 156, "fatigue_load_limit_kN": 18.9, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6600, "weight_g": 1280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N215EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 154 kN dynamic rating in the 75 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N215EA floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded N215EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 18.9 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.01 (156/154 kN) shows the high-static-capacity proportioning of this 75 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N215EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "If the shaft must be located both ways, do not use N215EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 154/156 kN pair here belongs to N215EA as printed, not to the bare size.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Do not replace N215EA with a deep-groove ball bearing on rating alone: line contact gives 154 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 154/156 kN ratings, 18.9 kN Pu and 1280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N215EA?", "a": "N215EA is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 156 kN, Pu 18.9 kN, grease limiting speed 4,700 r/min, oil 6,600 r/min, mass about 1280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N215EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N215EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n215ea", "＊n215ea", "N215EA" ], "locale_variants": {} }, { "sku": "N2215", "brand": "NTN", "manufacturer_designation": "NTN N2215", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 144, "static_load_kN": 162, "fatigue_load_limit_kN": 19.6, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2215 on the 75×130 mm envelope, 31 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,700 r/min. Digit by digit, N2215 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 88.5 mm and Ew 116.5 mm — the envelope inside the 75/130 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Grease limiting speed 4,700 r/min and oil 5,500 r/min are different limits for N2215: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 4,700 r/min and oil 5,500 r/min are different limits for N2215: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use N2215 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The N rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×31 mm envelope matches.", "The 144/162 kN ratings, 19.6 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2215?", "a": "N2215 is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 144 kN, C0 162 kN, Pu 19.6 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2215 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2215 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2215", "＊＊n2215", "N2215" ], "locale_variants": {} }, { "sku": "N2215EA", "brand": "NTN", "manufacturer_designation": "NTN N2215EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 191, "static_load_kN": 207, "fatigue_load_limit_kN": 25, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 5900, "weight_g": 1610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2215EA denotes a 75×130×31 mm (2.953 × 5.118 × 1.22 in) cylindrical roller bearing in the N2200 family, the EA high-capacity pressed sheet-steel cage. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 130 mm OD and 31 mm width from the ISO 15 general plan. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full N2215EA designation when purchasing. Rating life at 191 kN C assumes clean oil and adequate film; the 25 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of N2215EA; an oversized radius locks the ring on its face and tilts the 31 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use N2215EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/207 kN pair here belongs to N2215EA as printed, not to the bare size.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 191/207 kN ratings, 25 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2215EA?", "a": "N2215EA is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 207 kN, Pu 25 kN, grease limiting speed 4,200 r/min, oil 5,900 r/min, mass about 1610 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2215EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2215EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2215ea", "＊n2215ea", "N2215EA" ], "locale_variants": {} }, { "sku": "NF215", "brand": "NTN", "manufacturer_designation": "NTN NF215", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 111, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 75 mm shaft NTN supplies NF215: one integral rib on each ring; the open execution is rated 5,100 r/min on grease and 6,000 r/min on oil. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NF215 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 5,100 r/min is .85 of the 6,000 r/min oil value for NF215; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 75 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "If the shaft must be located both ways, do not use NF215 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF215 skids at 5,100 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 5,100 r/min and oil 6,000 r/min are different limits for NF215: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NF215 with a deep-groove ball bearing on rating alone: line contact gives 107 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 107/111 kN ratings, 13.4 kN Pu and 1210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF215?", "a": "NF215 is an NTN NF single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 111 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF215 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF215 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf215", "＊＊nf215", "NF215" ], "locale_variants": {} }, { "sku": "NF215EA", "brand": "NTN", "manufacturer_designation": "NTN NF215EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 154, "static_load_kN": 156, "fatigue_load_limit_kN": 18.9, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6600, "weight_g": 1280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF215EA denotes a 75×130×25 mm (2.953 × 5.118 × 0.984 in) cylindrical roller bearing in the NF200 family, the EA high-capacity pressed sheet-steel cage. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 130 mm OD and 25 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 88.5 mm and Ew 118.5 mm — the envelope inside the 75/130 mm bore/OD where the rollers actually run. Speed ratio check: limiting 4,700 r/min is .71 of the 6,600 r/min oil value for NF215EA; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 75 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The NF rib arrangement is not interchangeable with another prefix on the same 75 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 130×25 mm envelope matches.", "Do not replace NF215EA with a deep-groove ball bearing on rating alone: line contact gives 154 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The NF rib arrangement is not interchangeable with another prefix on the same 75 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 130×25 mm envelope matches.", "The 154/156 kN ratings, 18.9 kN Pu and 1280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF215EA?", "a": "NF215EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 156 kN, Pu 18.9 kN, grease limiting speed 4,700 r/min, oil 6,600 r/min, mass about 1280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF215EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF215EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf215ea", "＊nf215ea", "NF215EA" ], "locale_variants": {} }, { "sku": "NF2215EA", "brand": "NTN", "manufacturer_designation": "NTN NF2215EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 191, "static_load_kN": 207, "fatigue_load_limit_kN": 25, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 5900, "weight_g": 1610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF2215EA appears as a 75 mm bore single-row cylindrical roller bearing (191 kN C / 207 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NF2215EA as a pure radial bearing: keep P below 191 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 75 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The NF rib arrangement is not interchangeable with another prefix on the same 75 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 130×31 mm envelope matches.", "Do not replace NF2215EA with a deep-groove ball bearing on rating alone: line contact gives 191 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/207 kN pair here belongs to NF2215EA as printed, not to the bare size.", "The 191/207 kN ratings, 25 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2215EA?", "a": "NF2215EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 207 kN, Pu 25 kN, grease limiting speed 4,200 r/min, oil 5,900 r/min, mass about 1610 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2215EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2215EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2215ea", "＊nf2215ea", "NF2215EA" ], "locale_variants": {} }, { "sku": "NJ215", "brand": "NTN", "manufacturer_designation": "NTN NJ215", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 111, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ215 is the standard section of the NTN NJ200 dimension series for a 75 mm shaft — 107 kN of basic dynamic capacity in a 1210 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NJ215 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 1.4 kN-per-mm-bore figure (107 kN over 75 mm) lets a NJ215 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ215 non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ215 skids at 5,100 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 107/111 kN pair here belongs to NJ215 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 107/111 kN ratings, 13.4 kN Pu and 1210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ215?", "a": "NJ215 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 111 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ215 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ215 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ215-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj215", "＊＊nj215", "NJ215" ], "locale_variants": {} }, { "sku": "NJ215EA", "brand": "NTN", "manufacturer_designation": "NTN NJ215EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 154, "static_load_kN": 156, "fatigue_load_limit_kN": 18.9, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6600, "weight_g": 1280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ215EA appears as a 75 mm bore single-row cylindrical roller bearing (154 kN C / 156 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 130 mm OD and 25 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 88.5 mm and Ew 118.5 mm — the envelope inside the 75/130 mm bore/OD where the rollers actually run. Mass 1280 g for the 75×130×25 mm NJ215EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ215EA skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The NJ rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 130×25 mm envelope matches.", "The 154/156 kN ratings, 18.9 kN Pu and 1280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ215EA?", "a": "NJ215EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 156 kN, Pu 18.9 kN, grease limiting speed 4,700 r/min, oil 6,600 r/min, mass about 1280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ215EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ215EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj215ea", "＊nj215ea", "NJ215EA" ], "locale_variants": {} }, { "sku": "NJ2215", "brand": "NTN", "manufacturer_designation": "NTN NJ2215", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 144, "static_load_kN": 162, "fatigue_load_limit_kN": 19.6, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2215 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 75×130×31 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NJ2215 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 4,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,500 r/min for continuously high-duty 75 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2215 non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 27.5 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 144/162 kN pair here belongs to NJ2215 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 144/162 kN ratings, 19.6 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2215?", "a": "NJ2215 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 144 kN, C0 162 kN, Pu 19.6 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2215 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2215 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2215-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2215", "＊＊nj2215", "NJ2215" ], "locale_variants": {} }, { "sku": "NJ2215EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2215EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 191, "static_load_kN": 207, "fatigue_load_limit_kN": 25, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 5900, "weight_g": 1610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2215EA is the wide (22) section of the NTN NJ2200 dimension series for a 75 mm shaft — 191 kN of basic dynamic capacity in a 1610 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2215EA floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2215EA. Equivalent-load planning treats NJ2215EA as a pure radial bearing: keep P below 191 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NJ2215EA; an oversized radius locks the ring on its face and tilts the 31 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/207 kN pair here belongs to NJ2215EA as printed, not to the bare size.", "Open NJ2215EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The 31 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The 191/207 kN ratings, 25 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2215EA?", "a": "NJ2215EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 207 kN, Pu 25 kN, grease limiting speed 4,200 r/min, oil 5,900 r/min, mass about 1610 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2215EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2215EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2215ea", "＊nj2215ea", "NJ2215EA" ], "locale_variants": {} }, { "sku": "NU215-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU215", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 111, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU215 appears as a 75 mm bore single-row cylindrical roller bearing (107 kN C / 111 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NU215 designation when purchasing. Thermal planning around the 5,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 6,000 r/min for continuously high-duty 75 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Open NU215 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "Do not replace NU215 with a deep-groove ball bearing on rating alone: line contact gives 107 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 107/111 kN ratings, 13.4 kN Pu and 1210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU215?", "a": "NU215 is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 111 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU215 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU215 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu215", "＊＊nu215", "NU215", "NU215-NTN" ], "locale_variants": {} }, { "sku": "NU215EA", "brand": "NTN", "manufacturer_designation": "NTN NU215EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 154, "static_load_kN": 156, "fatigue_load_limit_kN": 18.9, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6600, "weight_g": 1280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU215EA on the 75×130 mm envelope, 25 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,700 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). With C 154 kN and C0 156 kN (C0/C ≈ 1.01) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. The 2.1 kN-per-mm-bore figure (154 kN over 75 mm) lets a NU215EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU215EA; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 27.5 mm section at 75 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 25 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU215EA skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "The 154/156 kN ratings, 18.9 kN Pu and 1280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU215EA?", "a": "NU215EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 156 kN, Pu 18.9 kN, grease limiting speed 4,700 r/min, oil 6,600 r/min, mass about 1280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU215EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU215EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu215ea", "＊nu215ea", "NU215EA" ], "locale_variants": {} }, { "sku": "NU2215", "brand": "NTN", "manufacturer_designation": "NTN NU2215", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 144, "static_load_kN": 162, "fatigue_load_limit_kN": 19.6, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2215 is the wide (22) section of the NTN NU2200 dimension series for a 75 mm shaft — 144 kN of basic dynamic capacity in a 1520 g, open bearing. Numbering ties NU2215 to its envelope: type code NU, series NU2200, 75 mm bore; the 130×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 144 kN and C0 162 kN (C0/C ≈ 1.13) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Rating life at 144 kN C assumes clean oil and adequate film; the 19.6 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 75 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Do not replace NU2215 with a deep-groove ball bearing on rating alone: line contact gives 144 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 4,700 r/min and oil 5,500 r/min are different limits for NU2215: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2215 skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "The 144/162 kN ratings, 19.6 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2215?", "a": "NU2215 is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 144 kN, C0 162 kN, Pu 19.6 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2215 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2215 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2215-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2215", "＊＊nu2215", "NU2215" ], "locale_variants": {} }, { "sku": "NU2215EA", "brand": "NTN", "manufacturer_designation": "NTN NU2215EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 191, "static_load_kN": 207, "fatigue_load_limit_kN": 25, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 5900, "weight_g": 1610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2215EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 191 kN dynamic rating in the 75 mm bore. Digit by digit, NU2215EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 5,900 r/min with oil versus 4,200 r/min with grease (a 1,700 r/min band), lubrication choice for NU2215EA is a thermal decision, not just a sealing one. The 75 mm (2.953 in) bore and 130 mm (5.118 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 31 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2215EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/207 kN pair here belongs to NU2215EA as printed, not to the bare size.", "The 27.5 mm section at 75 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "If the shaft must be located both ways, do not use NU2215EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 4,200 r/min and oil 5,900 r/min are different limits for NU2215EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 191/207 kN ratings, 25 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2215EA?", "a": "NU2215EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 207 kN, Pu 25 kN, grease limiting speed 4,200 r/min, oil 5,900 r/min, mass about 1610 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2215EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2215EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2215ea", "＊nu2215ea", "NU2215EA" ], "locale_variants": {} }, { "sku": "NUP215", "brand": "NTN", "manufacturer_designation": "NTN NUP215", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 111, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 6000, "weight_g": 1210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 75 mm shaft NTN supplies NUP215: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,100 r/min on grease and 6,000 r/min on oil. Digit by digit, NUP215 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP215 designation when purchasing. Speed ratio check: limiting 5,100 r/min is .85 of the 6,000 r/min oil value for NUP215; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP215.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Open NUP215 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The NUP rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 130×25 mm envelope matches.", "If the shaft must be located both ways, do not use NUP215 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 25 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 107/111 kN ratings, 13.4 kN Pu and 1210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP215?", "a": "NUP215 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 107 kN, C0 111 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP215 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP215 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP215-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup215", "＊＊nup215", "NUP215" ], "locale_variants": {} }, { "sku": "NUP215EA", "brand": "NTN", "manufacturer_designation": "NTN NUP215EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 154, "static_load_kN": 156, "fatigue_load_limit_kN": 18.9, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 6600, "weight_g": 1280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP215EA is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 75×130×25 mm ISO 15 envelope. Digit by digit, NUP215EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 25 mm width and 27.5 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NUP215EA as a pure radial bearing: keep P below 154 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP215EA; an oversized radius locks the ring on its face and tilts the 25 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP215EA skids at 4,700 r/min and fails by smearing long before L10 fatigue.", "The NUP rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 130×25 mm envelope matches.", "Grease limiting speed 4,700 r/min and oil 6,600 r/min are different limits for NUP215EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NUP215EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The 154/156 kN ratings, 18.9 kN Pu and 1280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP215EA?", "a": "NUP215EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 25 mm width (2.953 × 5.118 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 156 kN, Pu 18.9 kN, grease limiting speed 4,700 r/min, oil 6,600 r/min, mass about 1280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP215EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP215EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 6,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup215ea", "＊nup215ea", "NUP215EA" ], "locale_variants": {} }, { "sku": "NUP2215", "brand": "NTN", "manufacturer_designation": "NTN NUP2215", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 144, "static_load_kN": 162, "fatigue_load_limit_kN": 19.6, "limiting_speed_rpm": 4700, "max_rpm": 4700, "speed_oil_rpm": 5500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2215 denotes a 75×130×31 mm (2.953 × 5.118 × 1.22 in) cylindrical roller bearing in the NUP2200 family, a pressed sheet-steel cage. Numbering ties NUP2215 to its envelope: type code NUP, series NUP2200, 75 mm bore; the 130×31 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 31 mm width and 27.5 mm section put the NUP2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 4,700 r/min is .85 of the 5,500 r/min oil value for NUP2215; grease-churn heating closes that gap as fill quantity rises. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 75 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Do not replace NUP2215 with a deep-groove ball bearing on rating alone: line contact gives 144 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The 27.5 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 31 mm-wide cavity.", "Open NUP2215 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "The 144/162 kN ratings, 19.6 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2215 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2215?", "a": "NUP2215 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 144 kN, C0 162 kN, Pu 19.6 kN, grease limiting speed 4,700 r/min, oil 5,500 r/min, mass about 1520 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2215 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2215 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2215 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2215?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 116.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,700 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2215-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2215", "＊＊nup2215", "NUP2215" ], "locale_variants": {} }, { "sku": "NUP2215EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2215EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 191, "static_load_kN": 207, "fatigue_load_limit_kN": 25, "limiting_speed_rpm": 4200, "max_rpm": 4200, "speed_oil_rpm": 5900, "weight_g": 1610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2215EA is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 75×130×31 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NUP2215EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Do not replace NUP2215EA with a deep-groove ball bearing on rating alone: line contact gives 191 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2215EA skids at 4,200 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 191/207 kN ratings, 25 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2215EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2215EA?", "a": "NUP2215EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 207 kN, Pu 25 kN, grease limiting speed 4,200 r/min, oil 5,900 r/min, mass about 1610 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2215EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2215EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2215EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 88.5 mm, Ew 118.5 mm. The nominal bore/OD remain 75/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,200 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2215EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2215ea", "＊nup2215ea", "NUP2215EA" ], "locale_variants": {} }, { "sku": "N2315", "brand": "NTN", "manufacturer_designation": "NTN N2315", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 300, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 4770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 75 mm shaft NTN supplies N2315: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 3,800 r/min on grease and 4,500 r/min on oil. Numbering ties N2315 to its envelope: type code N, series N2300, 75 mm bore; the 160×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 42.5 mm radial section ((160−75)/2) frames the roller complement; capacity per millimetre of bore is about 3.8 kN/mm before application factors. Equivalent-load planning treats N2315 as a pure radial bearing: keep P below 286 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 42.5 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.", "If the shaft must be located both ways, do not use N2315 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 42.5 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.", "The 42.5 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.", "The 286/300 kN ratings, 35 kN Pu and 4770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2315?", "a": "N2315 is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 300 kN, Pu 35 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 4770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2315 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2315 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2315", "＊＊n2315", "N2315" ], "locale_variants": {} }, { "sku": "N2315EA", "brand": "NTN", "manufacturer_designation": "NTN N2315EA", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 395, "fatigue_load_limit_kN": 45.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 4850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 75 mm shaft NTN supplies N2315EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 3,500 r/min on grease and 4,900 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N2315EA floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 3,500 r/min grease and 4,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 75 mm bore. The 75 mm (2.953 in) bore and 160 mm (6.299 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 55 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Do not replace N2315EA with a deep-groove ball bearing on rating alone: line contact gives 390 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2315EA skids at 3,500 r/min and fails by smearing long before L10 fatigue.", "The 42.5 mm section at 75 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.", "If the shaft must be located both ways, do not use N2315EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 390/395 kN ratings, 45.5 kN Pu and 4850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2315EA?", "a": "N2315EA is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 395 kN, Pu 45.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 4850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2315EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2315EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2315ea", "＊n2315ea", "N2315EA" ], "locale_variants": {} }, { "sku": "N315", "brand": "NTN", "manufacturer_designation": "NTN N315", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 205, "fatigue_load_limit_kN": 23.8, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N315 is the standard section of the NTN N300 dimension series for a 75 mm shaft — 211 kN of basic dynamic capacity in a 3210 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N315 floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded N315 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N315 non-locating position preloads the bearing when the shaft grows.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N315 skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N315 skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 4,400 r/min and oil 5,200 r/min are different limits for N315: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace N315 with a deep-groove ball bearing on rating alone: line contact gives 211 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 211/205 kN ratings, 23.8 kN Pu and 3210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N315?", "a": "N315 is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 205 kN, Pu 23.8 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N315 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N315 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N315-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n315", "＊＊n315", "N315" ], "locale_variants": {} }, { "sku": "N315EA", "brand": "NTN", "manufacturer_designation": "NTN N315EA", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 284, "static_load_kN": 263, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 5600, "weight_g": 3280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N315EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 75×160×37 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). With C 284 kN and C0 263 kN (C0/C ≈ 0.93) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Thermal planning around the 4,000 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 5,600 r/min for continuously high-duty 75 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N315EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Grease limiting speed 4,000 r/min and oil 5,600 r/min are different limits for N315EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N315EA skids at 4,000 r/min and fails by smearing long before L10 fatigue.", "The 284/263 kN ratings, 30.5 kN Pu and 3280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N315EA?", "a": "N315EA is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 263 kN, Pu 30.5 kN, grease limiting speed 4,000 r/min, oil 5,600 r/min, mass about 3280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N315EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N315EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n315ea", "＊n315ea", "N315EA" ], "locale_variants": {} }, { "sku": "NF2315EA", "brand": "NTN", "manufacturer_designation": "NTN NF2315EA", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 395, "fatigue_load_limit_kN": 45.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 4850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF2315EA on the 75×160 mm envelope, 55 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,500 r/min. Numbering ties NF2315EA to its envelope: type code NF, series NF2300, 75 mm bore; the 160×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 3,500 r/min grease and 4,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 75 mm bore. The 75 mm (2.953 in) bore and 160 mm (6.299 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 55 mm-wide ring. Heat the inner ring to max 120 °C for the 75 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Grease limiting speed 3,500 r/min and oil 4,900 r/min are different limits for NF2315EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NF2315EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NF2315EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 390/395 kN ratings, 45.5 kN Pu and 4850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2315EA?", "a": "NF2315EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 395 kN, Pu 45.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 4850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2315EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2315EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2315ea", "＊nf2315ea", "NF2315EA" ], "locale_variants": {} }, { "sku": "NF315", "brand": "NTN", "manufacturer_designation": "NTN NF315", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 205, "fatigue_load_limit_kN": 23.8, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF315 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 211 kN dynamic rating in the 75 mm bore. Digit by digit, NF315 reads as NF (one rib on each ring), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NF315 designation when purchasing. Equivalent-load planning treats NF315 as a pure radial bearing: keep P below 211 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF315.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Do not replace NF315 with a deep-groove ball bearing on rating alone: line contact gives 211 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 37 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 211/205 kN ratings, 23.8 kN Pu and 3210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF315?", "a": "NF315 is an NTN NF single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 205 kN, Pu 23.8 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF315 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF315 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf315", "＊＊nf315", "NF315" ], "locale_variants": {} }, { "sku": "NF315EA", "brand": "NTN", "manufacturer_designation": "NTN NF315EA", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 284, "static_load_kN": 263, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 5600, "weight_g": 3280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 75 mm shaft NTN supplies NF315EA: one integral rib on each ring; the open execution is rated 4,000 r/min on grease and 5,600 r/min on oil. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF315EA floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF315EA. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Grease limiting speed 4,000 r/min and oil 5,600 r/min are different limits for NF315EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NF rib arrangement is not interchangeable with another prefix on the same 75 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 160×37 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 284/263 kN ratings, 30.5 kN Pu and 3280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF315EA?", "a": "NF315EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 263 kN, Pu 30.5 kN, grease limiting speed 4,000 r/min, oil 5,600 r/min, mass about 3280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF315EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF315EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf315ea", "＊nf315ea", "NF315EA" ], "locale_variants": {} }, { "sku": "NJ2315", "brand": "NTN", "manufacturer_designation": "NTN NJ2315", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 300, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 4770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2315 on the 75×160 mm envelope, 55 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,800 r/min. Numbering ties NJ2315 to its envelope: type code NJ, series NJ2300, 75 mm bore; the 160×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NJ2315 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 3.8 kN-per-mm-bore figure (286 kN over 75 mm) lets a NJ2315 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Open NJ2315 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "Do not replace NJ2315 with a deep-groove ball bearing on rating alone: line contact gives 286 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 286/300 kN ratings, 35 kN Pu and 4770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2315?", "a": "NJ2315 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 300 kN, Pu 35 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 4770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2315 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2315 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2315-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2315", "＊＊nj2315", "NJ2315" ], "locale_variants": {} }, { "sku": "NJ2315EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2315EA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 395, "fatigue_load_limit_kN": 45.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 4850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2315EA on the 75×160 mm envelope, 55 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,500 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 75 mm (00–03 use the 10/12/15/17 exception table). EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ2315EA designation when purchasing. Speed ratio check: limiting 3,500 r/min is .71 of the 4,900 r/min oil value for NJ2315EA; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 390/395 kN ratings, 45.5 kN Pu and 4850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2315EA?", "a": "NJ2315EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 395 kN, Pu 45.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 4850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2315EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2315EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2315ea", "＊nj2315ea", "NJ2315EA" ], "locale_variants": {} }, { "sku": "NJ315", "brand": "NTN", "manufacturer_designation": "NTN NJ315", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 205, "fatigue_load_limit_kN": 23.8, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ315 denotes a 75×160×37 mm (2.953 × 6.299 × 1.457 in) cylindrical roller bearing in the NJ300 family, a pressed sheet-steel cage. Numbering ties NJ315 to its envelope: type code NJ, series NJ300, 75 mm bore; the 160×37 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ315 designation when purchasing. The 75 mm (2.953 in) bore and 160 mm (6.299 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 37 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ315 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 37 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ315 skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "The 37 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 211/205 kN ratings, 23.8 kN Pu and 3210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ315?", "a": "NJ315 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 205 kN, Pu 23.8 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ315 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ315 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ315-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj315", "＊＊nj315", "NJ315" ], "locale_variants": {} }, { "sku": "NJ315EA", "brand": "NTN", "manufacturer_designation": "NTN NJ315EA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 284, "static_load_kN": 263, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 5600, "weight_g": 3280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ315EA on the 75×160 mm envelope, 37 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,000 r/min. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ315EA floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ315EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 30.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.93 (263/284 kN) shows the high-static-capacity proportioning of this 75 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ315EA skids at 4,000 r/min and fails by smearing long before L10 fatigue.", "The NJ rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 160×37 mm envelope matches.", "The NJ rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 160×37 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 284/263 kN ratings, 30.5 kN Pu and 3280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ315EA?", "a": "NJ315EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 263 kN, Pu 30.5 kN, grease limiting speed 4,000 r/min, oil 5,600 r/min, mass about 3280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ315EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ315EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj315ea", "＊nj315ea", "NJ315EA" ], "locale_variants": {} }, { "sku": "NU2315", "brand": "NTN", "manufacturer_designation": "NTN NU2315", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 300, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 4770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2315 denotes a 75×160×55 mm (2.953 × 6.299 × 2.165 in) cylindrical roller bearing in the NU2300 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2315 floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU2315 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 3.8 kN-per-mm-bore figure (286 kN over 75 mm) lets a NU2315 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 75 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 75 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 160×55 mm envelope matches.", "If the shaft must be located both ways, do not use NU2315 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU2315 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 286/300 kN ratings, 35 kN Pu and 4770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2315?", "a": "NU2315 is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 300 kN, Pu 35 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 4770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2315 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2315 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2315-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2315", "＊＊nu2315", "NU2315" ], "locale_variants": {} }, { "sku": "NU2315EA", "brand": "NTN", "manufacturer_designation": "NTN NU2315EA", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 395, "fatigue_load_limit_kN": 45.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 4850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2315EA denotes a 75×160×55 mm (2.953 × 6.299 × 2.165 in) cylindrical roller bearing in the NU2300 family, the EA high-capacity pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 160 mm OD and 55 mm width from the ISO 15 general plan. With C 390 kN and C0 395 kN (C0/C ≈ 1.01) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Rating life at 390 kN C assumes clean oil and adequate film; the 45.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 75 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Do not replace NU2315EA with a deep-groove ball bearing on rating alone: line contact gives 390 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NU2315EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2315EA skids at 3,500 r/min and fails by smearing long before L10 fatigue.", "The 390/395 kN ratings, 45.5 kN Pu and 4850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2315EA?", "a": "NU2315EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 395 kN, Pu 45.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 4850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2315EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2315EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2315ea", "＊nu2315ea", "NU2315EA" ], "locale_variants": {} }, { "sku": "NU315-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU315", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 205, "fatigue_load_limit_kN": 23.8, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU315 on the 75×160 mm envelope, 37 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,400 r/min. Numbering ties NU315 to its envelope: type code NU, series NU300, 75 mm bore; the 160×37 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU315. Mass 3210 g for the 75×160×37 mm NU315 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Do not replace NU315 with a deep-groove ball bearing on rating alone: line contact gives 211 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 37 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 211/205 kN pair here belongs to NU315 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 211/205 kN ratings, 23.8 kN Pu and 3210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU315?", "a": "NU315 is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 205 kN, Pu 23.8 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU315 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU315 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu315", "＊＊nu315", "NU315", "NU315-NTN" ], "locale_variants": {} }, { "sku": "NU315EA", "brand": "NTN", "manufacturer_designation": "NTN NU315EA", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 284, "static_load_kN": 263, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 5600, "weight_g": 3280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU315EA appears as a 75 mm bore single-row cylindrical roller bearing (284 kN C / 263 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU315EA reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 95 mm and Ew 143 mm — the envelope inside the 75/160 mm bore/OD where the rollers actually run. Mass 3280 g for the 75×160×37 mm NU315EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 75 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 160×37 mm envelope matches.", "The 37 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NU rib arrangement is not interchangeable with another prefix on the same 75 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 160×37 mm envelope matches.", "The 284/263 kN ratings, 30.5 kN Pu and 3280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU315EA?", "a": "NU315EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 263 kN, Pu 30.5 kN, grease limiting speed 4,000 r/min, oil 5,600 r/min, mass about 3280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU315EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU315EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu315ea", "＊nu315ea", "NU315EA" ], "locale_variants": {} }, { "sku": "NUP2315", "brand": "NTN", "manufacturer_designation": "NTN NUP2315", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 300, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 4770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2315 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 75×160×55 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2315 floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2315. Thermal planning around the 3,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,500 r/min for continuously high-duty 75 mm positions. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 75 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 160×55 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NUP rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 160×55 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 286/300 kN ratings, 35 kN Pu and 4770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2315?", "a": "NUP2315 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 300 kN, Pu 35 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 4770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2315 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2315 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2315-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2315", "＊＊nup2315", "NUP2315" ], "locale_variants": {} }, { "sku": "NUP2315EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2315EA", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 395, "fatigue_load_limit_kN": 45.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 4850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2315EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 390 kN dynamic rating in the 75 mm bore. Digit by digit, NUP2315EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 42.5 mm radial section ((160−75)/2) frames the roller complement; capacity per millimetre of bore is about 5.2 kN/mm before application factors. The 5.2 kN-per-mm-bore figure (390 kN over 75 mm) lets a NUP2315EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 75 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "Grease limiting speed 3,500 r/min and oil 4,900 r/min are different limits for NUP2315EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 42.5 mm section at 75 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.", "The 390/395 kN ratings, 45.5 kN Pu and 4850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2315EA?", "a": "NUP2315EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 395 kN, Pu 45.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 4850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2315EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2315EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2315ea", "＊nup2315ea", "NUP2315EA" ], "locale_variants": {} }, { "sku": "NUP315", "brand": "NTN", "manufacturer_designation": "NTN NUP315", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 205, "fatigue_load_limit_kN": 23.8, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5200, "weight_g": 3210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP315 appears as a 75 mm bore single-row cylindrical roller bearing (211 kN C / 205 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 160 mm OD and 37 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 4,400 r/min grease and 5,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 75 mm bore. Thermal planning around the 4,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,200 r/min for continuously high-duty 75 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP315 skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "The 42.5 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "If the shaft must be located both ways, do not use NUP315 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 211/205 kN ratings, 23.8 kN Pu and 3210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP315 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP315?", "a": "NUP315 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 205 kN, Pu 23.8 kN, grease limiting speed 4,400 r/min, oil 5,200 r/min, mass about 3210 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP315 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP315 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP315 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP315?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.5 mm, Ew 139.5 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP315-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup315", "＊＊nup315", "NUP315" ], "locale_variants": {} }, { "sku": "NUP315EA", "brand": "NTN", "manufacturer_designation": "NTN NUP315EA", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 284, "static_load_kN": 263, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 5600, "weight_g": 3280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP315EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 284 kN dynamic rating in the 75 mm bore. Numbering ties NUP315EA to its envelope: type code NUP, series NUP300, 75 mm bore; the 160×37 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NUP315EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 4,000 r/min is .71 of the 5,600 r/min oil value for NUP315EA; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 75 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 284/263 kN pair here belongs to NUP315EA as printed, not to the bare size.", "The 42.5 mm section at 75 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 284/263 kN pair here belongs to NUP315EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 284/263 kN ratings, 30.5 kN Pu and 3280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP315EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP315EA?", "a": "NUP315EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 263 kN, Pu 30.5 kN, grease limiting speed 4,000 r/min, oil 5,600 r/min, mass about 3280 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP315EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP315EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP315EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95 mm, Ew 143 mm. The nominal bore/OD remain 75/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP315EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup315ea", "＊nup315ea", "NUP315EA" ], "locale_variants": {} }, { "sku": "N415", "brand": "NTN", "manufacturer_designation": "NTN N415", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 274, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 6060, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N415 denotes a 75×190×45 mm (2.953 × 7.48 × 1.772 in) cylindrical roller bearing in the N400 family, a pressed sheet-steel cage. Digit by digit, N415 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 75 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 104.5 mm and Ew 160.5 mm — the envelope inside the 75/190 mm bore/OD where the rollers actually run. Rating life at 291 kN C assumes clean oil and adequate film; the 30.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N415 non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace N415 with a deep-groove ball bearing on rating alone: line contact gives 291 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 75 mm inner ring.", "The N rib arrangement is not interchangeable with another prefix on the same 75 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 190×45 mm envelope matches.", "The 291/274 kN ratings, 30.5 kN Pu and 6060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N415 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N415?", "a": "N415 is an NTN N single-row cylindrical roller bearing to ISO 15: 75 mm bore, 190 mm OD and 45 mm width (2.953 × 7.48 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 291 kN, C0 274 kN, Pu 30.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 6060 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N415 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N415 is supplied in the standard open execution shown in the table." }, { "q": "Can N415 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N415?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 104.5 mm, Ew 160.5 mm. The nominal bore/OD remain 75/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N415", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n415", "N415" ], "locale_variants": {} }, { "sku": "NF415", "brand": "NTN", "manufacturer_designation": "NTN NF415", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 274, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 6060, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF415 appears as a 75 mm bore single-row cylindrical roller bearing (291 kN C / 274 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 75 mm, with 190 mm OD and 45 mm width from the ISO 15 general plan. At 3,700 r/min with oil versus 3,200 r/min with grease (a 500 r/min band), lubrication choice for NF415 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 30.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.94 (274/291 kN) shows the high-static-capacity proportioning of this 75 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF415.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 291/274 kN pair here belongs to NF415 as printed, not to the bare size.", "Grease limiting speed 3,200 r/min and oil 3,700 r/min are different limits for NF415: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF415 skids at 3,200 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 3,200 r/min and oil 3,700 r/min are different limits for NF415: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 291/274 kN ratings, 30.5 kN Pu and 6060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF415 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF415?", "a": "NF415 is an NTN NF single-row cylindrical roller bearing to ISO 15: 75 mm bore, 190 mm OD and 45 mm width (2.953 × 7.48 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 291 kN, C0 274 kN, Pu 30.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 6060 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF415 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF415 is supplied in the standard open execution shown in the table." }, { "q": "Can NF415 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF415?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 104.5 mm, Ew 160.5 mm. The nominal bore/OD remain 75/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF415", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf415", "NF415" ], "locale_variants": {} }, { "sku": "NJ415-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ415", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 274, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 6060, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ415 on the 75×190 mm envelope, 45 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,200 r/min. Numbering ties NJ415 to its envelope: type code NJ, series NJ400, 75 mm bore; the 190×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ415. Selection arithmetic: Pu 30.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.94 (274/291 kN) shows the high-static-capacity proportioning of this 75 mm bore. Housing and shaft fillets must clear the ring chamfers of NJ415; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The 57.5 mm section at 75 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ415 skids at 3,200 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NJ415 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "The 291/274 kN ratings, 30.5 kN Pu and 6060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ415 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ415?", "a": "NJ415 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 75 mm bore, 190 mm OD and 45 mm width (2.953 × 7.48 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 291 kN, C0 274 kN, Pu 30.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 6060 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ415 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ415 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ415 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ415?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 104.5 mm, Ew 160.5 mm. The nominal bore/OD remain 75/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj415", "NJ415", "NJ415-NTN" ], "locale_variants": {} }, { "sku": "NU415-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU415", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 274, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 6060, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU415 appears as a 75 mm bore single-row cylindrical roller bearing (291 kN C / 274 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU415 floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU415 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU415.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NU415 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 75 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 75 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 291/274 kN ratings, 30.5 kN Pu and 6060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU415 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU415?", "a": "NU415 is an NTN NU single-row cylindrical roller bearing to ISO 15: 75 mm bore, 190 mm OD and 45 mm width (2.953 × 7.48 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 291 kN, C0 274 kN, Pu 30.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 6060 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU415 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU415 is supplied in the standard open execution shown in the table." }, { "q": "Can NU415 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU415?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 104.5 mm, Ew 160.5 mm. The nominal bore/OD remain 75/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu415", "NU415", "NU415-NTN" ], "locale_variants": {} }, { "sku": "NUP415", "brand": "NTN", "manufacturer_designation": "NTN NUP415", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 274, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 6060, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP415 is the heavy (04) section of the NTN NUP400 dimension series for a 75 mm shaft — 291 kN of basic dynamic capacity in a 6060 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP415 floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP415. Selection arithmetic: Pu 30.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.94 (274/291 kN) shows the high-static-capacity proportioning of this 75 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP415; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP415 skids at 3,200 r/min and fails by smearing long before L10 fatigue.", "Do not replace NUP415 with a deep-groove ball bearing on rating alone: line contact gives 291 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NUP415 with a deep-groove ball bearing on rating alone: line contact gives 291 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "The 291/274 kN ratings, 30.5 kN Pu and 6060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP415 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP415?", "a": "NUP415 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 190 mm OD and 45 mm width (2.953 × 7.48 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 291 kN, C0 274 kN, Pu 30.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 6060 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP415 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP415 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP415 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP415?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 104.5 mm, Ew 160.5 mm. The nominal bore/OD remain 75/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP415", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=149", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup415", "NUP415" ], "locale_variants": {} }, { "sku": "N1016", "brand": "NTN", "manufacturer_designation": "NTN N1016", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 90.5, "fatigue_load_limit_kN": 11, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1016 appears as a 80 mm bore single-row cylindrical roller bearing (80 kN C / 90.5 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N1016 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 91.5 mm and Ew 113.5 mm — the envelope inside the 80/125 mm bore/OD where the rollers actually run. Mass 965 g for the 80×125×22 mm N1016 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 80 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1016 skids at 5,700 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 5,700 r/min and oil 6,700 r/min are different limits for N1016: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use N1016 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The N rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 125×22 mm envelope matches.", "The 80/90.5 kN ratings, 11 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1016 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1016?", "a": "N1016 is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 125 mm OD and 22 mm width (3.15 × 4.921 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 80 kN, C0 90.5 kN, Pu 11 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1016 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1016 is supplied in the standard open execution shown in the table." }, { "q": "Can N1016 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1016?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 91.5 mm, Ew 113.5 mm. The nominal bore/OD remain 80/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1016", "N1016" ], "locale_variants": {} }, { "sku": "NJ1016", "brand": "NTN", "manufacturer_designation": "NTN NJ1016", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 90.5, "fatigue_load_limit_kN": 11, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1016 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 80 kN dynamic rating in the 80 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NJ1016 as a pure radial bearing: keep P below 80 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "The 22.5 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "The 22.5 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 125 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 80/90.5 kN pair here belongs to NJ1016 as printed, not to the bare size.", "The 80/90.5 kN ratings, 11 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1016 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1016?", "a": "NJ1016 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 125 mm OD and 22 mm width (3.15 × 4.921 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 80 kN, C0 90.5 kN, Pu 11 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1016 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1016 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1016 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1016?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 91.5 mm, Ew 113.5 mm. The nominal bore/OD remain 80/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1016-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1016", "NJ1016" ], "locale_variants": {} }, { "sku": "NN3016", "brand": "NTN", "manufacturer_designation": "NTN NN3016", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 128, "static_load_kN": 179, "fatigue_load_limit_kN": 21.6, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 5900, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NN3016 on the 80×125 mm envelope, 34 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 5,100 r/min. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 125 mm OD and 34 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 22.5 mm radial section between the 80 mm bore and 125 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Thermal planning around the 5,100 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 5,900 r/min for continuously high-duty 80 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 80 mm shaft.", "applications": [ "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Open NN3016 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The NN rib arrangement is not interchangeable with another prefix on the same 80 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 125×34 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3016 skids at 5,100 r/min and fails by smearing long before L10 fatigue.", "The NN rib arrangement is not interchangeable with another prefix on the same 80 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 125×34 mm envelope matches.", "The 128/179 kN ratings, 21.6 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3016 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3016?", "a": "NN3016 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 80 mm bore, 125 mm OD and 34 mm width (3.15 × 4.921 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 128 kN, C0 179 kN, Pu 21.6 kN, grease limiting speed 5,100 r/min, oil 5,900 r/min, mass about 1520 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3016 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3016 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3016?", "a": "NN3016 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3016?", "a": "NTN rates NN3016 at 5,100 r/min with grease and 5,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3016", "NN3016" ], "locale_variants": {} }, { "sku": "NN3016K", "brand": "NTN", "manufacturer_designation": "NTN NN3016K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 128, "static_load_kN": 179, "fatigue_load_limit_kN": 21.6, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 5900, "weight_g": 1470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3016K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 128 kN dynamic rating in the 80 mm bore. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 125 mm OD and 34 mm width from the ISO 15 general plan. The 22.5 mm radial section ((125−80)/2) frames the roller complement; capacity per millimetre of bore is about 1.6 kN/mm before application factors. The 1.6 kN-per-mm-bore figure (128 kN over 80 mm) lets a NN3016K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 80 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 5,100 r/min and oil 5,900 r/min are different limits for NN3016K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 22.5 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 34 mm-wide cavity.", "The 128/179 kN ratings, 21.6 kN Pu and 1470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3016K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3016K?", "a": "NN3016K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 80 mm bore, 125 mm OD and 34 mm width (3.15 × 4.921 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 128 kN, C0 179 kN, Pu 21.6 kN, grease limiting speed 5,100 r/min, oil 5,900 r/min, mass about 1470 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3016K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3016K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3016K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3016K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3016 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3016K?", "a": "NTN rates NN3016K at 5,100 r/min with grease and 5,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3016K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3016k", "NN3016K" ], "locale_variants": {} }, { "sku": "NU1016-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU1016", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 90.5, "fatigue_load_limit_kN": 11, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 80 mm shaft NTN supplies NU1016: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 5,700 r/min on grease and 6,700 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1016 floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU1016 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 80 mm (3.15 in) bore and 125 mm (4.921 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 22 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "Do not replace NU1016 with a deep-groove ball bearing on rating alone: line contact gives 80 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1016 skids at 5,700 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 80/90.5 kN ratings, 11 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1016 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1016?", "a": "NU1016 is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 125 mm OD and 22 mm width (3.15 × 4.921 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 80 kN, C0 90.5 kN, Pu 11 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1016 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1016 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1016 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1016?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 91.5 mm, Ew 113.5 mm. The nominal bore/OD remain 80/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1016", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1016", "NU1016", "NU1016-NTN" ], "locale_variants": {} }, { "sku": "NUP1016", "brand": "NTN", "manufacturer_designation": "NTN NUP1016", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 90.5, "fatigue_load_limit_kN": 11, "limiting_speed_rpm": 5700, "max_rpm": 5700, "speed_oil_rpm": 6700, "weight_g": 965, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP1016 on the 80×125 mm envelope, 22 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,700 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 125 mm OD and 22 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 91.5 mm and Ew 113.5 mm — the envelope inside the 80/125 mm bore/OD where the rollers actually run. Speed ratio check: limiting 5,700 r/min is .85 of the 6,700 r/min oil value for NUP1016; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP1016 non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 125 mm raceway.", "If the shaft must be located both ways, do not use NUP1016 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 22.5 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "The 22.5 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "The NUP rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 125×22 mm envelope matches.", "The 80/90.5 kN ratings, 11 kN Pu and 965 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1016 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1016?", "a": "NUP1016 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 125 mm OD and 22 mm width (3.15 × 4.921 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 80 kN, C0 90.5 kN, Pu 11 kN, grease limiting speed 5,700 r/min, oil 6,700 r/min, mass about 965 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1016 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1016 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1016 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1016?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 91.5 mm, Ew 113.5 mm. The nominal bore/OD remain 80/125 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,700 r/min grease / 6,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1016", "NUP1016" ], "locale_variants": {} }, { "sku": "N216", "brand": "NTN", "manufacturer_designation": "NTN N216", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 118, "static_load_kN": 122, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 1470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N216 on the 80×140 mm envelope, 26 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,800 r/min. Digit by digit, N216 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N216. Selection arithmetic: Pu 14.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.03 (122/118 kN) shows the high-static-capacity proportioning of this 80 mm bore. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Grease limiting speed 4,800 r/min and oil 5,700 r/min are different limits for N216: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 4,800 r/min and oil 5,700 r/min are different limits for N216: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open N216 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 118/122 kN ratings, 14.5 kN Pu and 1470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N216?", "a": "N216 is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 118 kN, C0 122 kN, Pu 14.5 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 1470 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N216 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N216 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N216-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n216", "＊＊n216", "N216" ], "locale_variants": {} }, { "sku": "N216EA", "brand": "NTN", "manufacturer_designation": "NTN N216EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 167, "fatigue_load_limit_kN": 19.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6100, "weight_g": 1560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N216EA appears as a 80 mm bore single-row cylindrical roller bearing (165 kN C / 167 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N216EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full N216EA designation when purchasing. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N216EA skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N216EA skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The 165/167 kN ratings, 19.7 kN Pu and 1560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N216EA?", "a": "N216EA is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 165 kN, C0 167 kN, Pu 19.7 kN, grease limiting speed 4,400 r/min, oil 6,100 r/min, mass about 1560 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N216EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N216EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n216ea", "＊n216ea", "N216EA" ], "locale_variants": {} }, { "sku": "N2216", "brand": "NTN", "manufacturer_designation": "NTN N2216", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 163, "static_load_kN": 186, "fatigue_load_limit_kN": 22, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5100, "weight_g": 1890, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2216 is the wide (22) section of the NTN N2200 dimension series for a 80 mm shaft — 163 kN of basic dynamic capacity in a 1890 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N2216 floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2216 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 1890 g for the 80×140×33 mm N2216 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The 30.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 163/186 kN ratings, 22 kN Pu and 1890 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2216?", "a": "N2216 is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 163 kN, C0 186 kN, Pu 22 kN, grease limiting speed 4,400 r/min, oil 5,100 r/min, mass about 1890 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2216 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2216 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2216", "＊＊n2216", "N2216" ], "locale_variants": {} }, { "sku": "N2216EA", "brand": "NTN", "manufacturer_designation": "NTN N2216EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 220, "static_load_kN": 243, "fatigue_load_limit_kN": 28.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2216EA is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 80×140×33 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). At 5,500 r/min with oil versus 3,900 r/min with grease (a 1,600 r/min band), lubrication choice for N2216EA is a thermal decision, not just a sealing one. The 2.8 kN-per-mm-bore figure (220 kN over 80 mm) lets a N2216EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of N2216EA; an oversized radius locks the ring on its face and tilts the 33 mm-wide seat.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 220/243 kN pair here belongs to N2216EA as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Grease limiting speed 3,900 r/min and oil 5,500 r/min are different limits for N2216EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 220/243 kN ratings, 28.7 kN Pu and 2020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2216EA?", "a": "N2216EA is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 220 kN, C0 243 kN, Pu 28.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2020 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2216EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2216EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2216ea", "＊n2216ea", "N2216EA" ], "locale_variants": {} }, { "sku": "NF216", "brand": "NTN", "manufacturer_designation": "NTN NF216", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 118, "static_load_kN": 122, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 1470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF216 denotes a 80×140×26 mm (3.15 × 5.512 × 1.024 in) cylindrical roller bearing in the NF200 family, a pressed sheet-steel cage. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 140 mm OD and 26 mm width from the ISO 15 general plan. With C 118 kN and C0 122 kN (C0/C ≈ 1.03) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. The 1.5 kN-per-mm-bore figure (118 kN over 80 mm) lets a NF216 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 80 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The NF rib arrangement is not interchangeable with another prefix on the same 80 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 140×26 mm envelope matches.", "If the shaft must be located both ways, do not use NF216 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF216 skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "The 118/122 kN ratings, 14.5 kN Pu and 1470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF216?", "a": "NF216 is an NTN NF single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 118 kN, C0 122 kN, Pu 14.5 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 1470 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF216 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF216 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf216", "＊＊nf216", "NF216" ], "locale_variants": {} }, { "sku": "NF216EA", "brand": "NTN", "manufacturer_designation": "NTN NF216EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 167, "fatigue_load_limit_kN": 19.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6100, "weight_g": 1560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF216EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 80×140×26 mm ISO 15 envelope. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF216EA floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. At 6,100 r/min with oil versus 4,400 r/min with grease (a 1,700 r/min band), lubrication choice for NF216EA is a thermal decision, not just a sealing one. Equivalent-load planning treats NF216EA as a pure radial bearing: keep P below 165 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF216EA.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Grease limiting speed 4,400 r/min and oil 6,100 r/min are different limits for NF216EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 4,400 r/min and oil 6,100 r/min are different limits for NF216EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF216EA skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 4,400 r/min and oil 6,100 r/min are different limits for NF216EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 165/167 kN ratings, 19.7 kN Pu and 1560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF216EA?", "a": "NF216EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 165 kN, C0 167 kN, Pu 19.7 kN, grease limiting speed 4,400 r/min, oil 6,100 r/min, mass about 1560 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF216EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF216EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf216ea", "＊nf216ea", "NF216EA" ], "locale_variants": {} }, { "sku": "NF2216EA", "brand": "NTN", "manufacturer_designation": "NTN NF2216EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 220, "static_load_kN": 243, "fatigue_load_limit_kN": 28.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2216EA is the wide (22) section of the NTN NF2200 dimension series for a 80 mm shaft — 220 kN of basic dynamic capacity in a 2020 g, open bearing. Numbering ties NF2216EA to its envelope: type code NF, series NF2200, 80 mm bore; the 140×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NF2216EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 28.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.10 (243/220 kN) shows the high-static-capacity proportioning of this 80 mm bore. Heat the inner ring to max 120 °C for the 80 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Grease limiting speed 3,900 r/min and oil 5,500 r/min are different limits for NF2216EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NF2216EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 220/243 kN pair here belongs to NF2216EA as printed, not to the bare size.", "Do not replace NF2216EA with a deep-groove ball bearing on rating alone: line contact gives 220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 220/243 kN ratings, 28.7 kN Pu and 2020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2216EA?", "a": "NF2216EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 220 kN, C0 243 kN, Pu 28.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2020 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2216EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2216EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2216ea", "＊nf2216ea", "NF2216EA" ], "locale_variants": {} }, { "sku": "NJ216", "brand": "NTN", "manufacturer_designation": "NTN NJ216", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 118, "static_load_kN": 122, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 1470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 80 mm shaft NTN supplies NJ216: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 4,800 r/min on grease and 5,700 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 140 mm OD and 26 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ216. Selection arithmetic: Pu 14.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.03 (122/118 kN) shows the high-static-capacity proportioning of this 80 mm bore. Housing and shaft fillets must clear the ring chamfers of NJ216; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 30.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 26 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ216 skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 118/122 kN ratings, 14.5 kN Pu and 1470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ216?", "a": "NJ216 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 118 kN, C0 122 kN, Pu 14.5 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 1470 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ216 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ216 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ216-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj216", "＊＊nj216", "NJ216" ], "locale_variants": {} }, { "sku": "NJ216EA", "brand": "NTN", "manufacturer_designation": "NTN NJ216EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 167, "fatigue_load_limit_kN": 19.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6100, "weight_g": 1560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ216EA denotes a 80×140×26 mm (3.15 × 5.512 × 1.024 in) cylindrical roller bearing in the NJ200 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ216EA floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ216EA. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Housing and shaft fillets must clear the ring chamfers of NJ216EA; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ216EA skids at 4,400 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 4,400 r/min and oil 6,100 r/min are different limits for NJ216EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NJ216EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 165/167 kN ratings, 19.7 kN Pu and 1560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ216EA?", "a": "NJ216EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 165 kN, C0 167 kN, Pu 19.7 kN, grease limiting speed 4,400 r/min, oil 6,100 r/min, mass about 1560 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ216EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ216EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj216ea", "＊nj216ea", "NJ216EA" ], "locale_variants": {} }, { "sku": "NJ2216", "brand": "NTN", "manufacturer_designation": "NTN NJ2216", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 163, "static_load_kN": 186, "fatigue_load_limit_kN": 22, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5100, "weight_g": 1890, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2216 appears as a 80 mm bore single-row cylindrical roller bearing (163 kN C / 186 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 140 mm OD and 33 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2216. The 80 mm (3.15 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 33 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NJ2216; an oversized radius locks the ring on its face and tilts the 33 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "If the shaft must be located both ways, do not use NJ2216 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 163/186 kN ratings, 22 kN Pu and 1890 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2216?", "a": "NJ2216 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 163 kN, C0 186 kN, Pu 22 kN, grease limiting speed 4,400 r/min, oil 5,100 r/min, mass about 1890 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2216 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2216 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2216-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2216", "＊＊nj2216", "NJ2216" ], "locale_variants": {} }, { "sku": "NJ2216EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2216EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 220, "static_load_kN": 243, "fatigue_load_limit_kN": 28.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2216EA denotes a 80×140×33 mm (3.15 × 5.512 × 1.299 in) cylindrical roller bearing in the NJ2200 family, the EA high-capacity pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). With C 220 kN and C0 243 kN (C0/C ≈ 1.10) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 80 mm (3.15 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 33 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 80 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2216EA skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2216EA skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2216EA skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "The 220/243 kN ratings, 28.7 kN Pu and 2020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2216EA?", "a": "NJ2216EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 220 kN, C0 243 kN, Pu 28.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2020 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2216EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2216EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2216ea", "＊nj2216ea", "NJ2216EA" ], "locale_variants": {} }, { "sku": "NU216-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU216", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 118, "static_load_kN": 122, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 1470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU216 on the 80×140 mm envelope, 26 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,800 r/min. Digit by digit, NU216 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Rating life at 118 kN C assumes clean oil and adequate film; the 14.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 80 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×26 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NU216 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 118/122 kN pair here belongs to NU216 as printed, not to the bare size.", "The 118/122 kN ratings, 14.5 kN Pu and 1470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU216?", "a": "NU216 is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 118 kN, C0 122 kN, Pu 14.5 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 1470 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU216 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU216 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu216", "＊＊nu216", "NU216", "NU216-NTN" ], "locale_variants": {} }, { "sku": "NU216EA", "brand": "NTN", "manufacturer_designation": "NTN NU216EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 167, "fatigue_load_limit_kN": 19.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6100, "weight_g": 1560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 80 mm shaft NTN supplies NU216EA: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,400 r/min on grease and 6,100 r/min on oil. Numbering ties NU216EA to its envelope: type code NU, series NU200, 80 mm bore; the 140×26 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NU216EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 80 mm (3.15 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 26 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU216EA; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Grease limiting speed 4,400 r/min and oil 6,100 r/min are different limits for NU216EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NU rib arrangement is not interchangeable with another prefix on the same 80 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×26 mm envelope matches.", "The NU rib arrangement is not interchangeable with another prefix on the same 80 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×26 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 165/167 kN ratings, 19.7 kN Pu and 1560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU216EA?", "a": "NU216EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 165 kN, C0 167 kN, Pu 19.7 kN, grease limiting speed 4,400 r/min, oil 6,100 r/min, mass about 1560 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU216EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU216EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu216ea", "＊nu216ea", "NU216EA" ], "locale_variants": {} }, { "sku": "NU2216", "brand": "NTN", "manufacturer_designation": "NTN NU2216", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 163, "static_load_kN": 186, "fatigue_load_limit_kN": 22, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5100, "weight_g": 1890, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 80 mm shaft NTN supplies NU2216: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,400 r/min on grease and 5,100 r/min on oil. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). The 33 mm width and 30.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NU2216 as a pure radial bearing: keep P below 163 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2216.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Open NU2216 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "Open NU2216 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 163/186 kN ratings, 22 kN Pu and 1890 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2216?", "a": "NU2216 is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 163 kN, C0 186 kN, Pu 22 kN, grease limiting speed 4,400 r/min, oil 5,100 r/min, mass about 1890 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2216 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2216 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2216-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2216", "＊＊nu2216", "NU2216" ], "locale_variants": {} }, { "sku": "NU2216EA", "brand": "NTN", "manufacturer_designation": "NTN NU2216EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 220, "static_load_kN": 243, "fatigue_load_limit_kN": 28.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2216EA appears as a 80 mm bore single-row cylindrical roller bearing (220 kN C / 243 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 140 mm OD and 33 mm width from the ISO 15 general plan. The 33 mm width and 30.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 2020 g for the 80×140×33 mm NU2216EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2216EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Do not replace NU2216EA with a deep-groove ball bearing on rating alone: line contact gives 220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 30.0 mm section at 80 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Open NU2216EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 220/243 kN ratings, 28.7 kN Pu and 2020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2216EA?", "a": "NU2216EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 220 kN, C0 243 kN, Pu 28.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2020 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2216EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2216EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2216ea", "＊nu2216ea", "NU2216EA" ], "locale_variants": {} }, { "sku": "NUP216", "brand": "NTN", "manufacturer_designation": "NTN NUP216", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 118, "static_load_kN": 122, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5700, "weight_g": 1470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP216 denotes a 80×140×26 mm (3.15 × 5.512 × 1.024 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP216 floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 1.5 kN-per-mm-bore figure (118 kN over 80 mm) lets a NUP216 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP216 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Do not replace NUP216 with a deep-groove ball bearing on rating alone: line contact gives 118 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 30.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 26 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 118/122 kN pair here belongs to NUP216 as printed, not to the bare size.", "The 118/122 kN ratings, 14.5 kN Pu and 1470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP216?", "a": "NUP216 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 118 kN, C0 122 kN, Pu 14.5 kN, grease limiting speed 4,800 r/min, oil 5,700 r/min, mass about 1470 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP216 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP216 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP216-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup216", "＊＊nup216", "NUP216" ], "locale_variants": {} }, { "sku": "NUP216EA", "brand": "NTN", "manufacturer_designation": "NTN NUP216EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 167, "fatigue_load_limit_kN": 19.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 6100, "weight_g": 1560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP216EA on the 80×140 mm envelope, 26 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,400 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 140 mm OD and 26 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP216EA. Selection arithmetic: Pu 19.7 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.01 (167/165 kN) shows the high-static-capacity proportioning of this 80 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP216EA; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NUP216EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 165/167 kN ratings, 19.7 kN Pu and 1560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP216EA?", "a": "NUP216EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 26 mm width (3.15 × 5.512 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 165 kN, C0 167 kN, Pu 19.7 kN, grease limiting speed 4,400 r/min, oil 6,100 r/min, mass about 1560 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP216EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP216EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 6,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup216ea", "＊nup216ea", "NUP216EA" ], "locale_variants": {} }, { "sku": "NUP2216", "brand": "NTN", "manufacturer_designation": "NTN NUP2216", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 163, "static_load_kN": 186, "fatigue_load_limit_kN": 22, "limiting_speed_rpm": 4400, "max_rpm": 4400, "speed_oil_rpm": 5100, "weight_g": 1890, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2216 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 163 kN dynamic rating in the 80 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 95.3 mm and Ew 125.3 mm — the envelope inside the 80/140 mm bore/OD where the rollers actually run. The 2.0 kN-per-mm-bore figure (163 kN over 80 mm) lets a NUP2216 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2216.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Open NUP2216 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The NUP rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "The NUP rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "The 163/186 kN ratings, 22 kN Pu and 1890 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2216 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2216?", "a": "NUP2216 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 163 kN, C0 186 kN, Pu 22 kN, grease limiting speed 4,400 r/min, oil 5,100 r/min, mass about 1890 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2216 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2216 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2216 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2216?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 125.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,400 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2216-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2216", "＊＊nup2216", "NUP2216" ], "locale_variants": {} }, { "sku": "NUP2216EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2216EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 220, "static_load_kN": 243, "fatigue_load_limit_kN": 28.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2216EA on the 80×140 mm envelope, 33 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,900 r/min. Numbering ties NUP2216EA to its envelope: type code NUP, series NUP2200, 80 mm bore; the 140×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NUP2216EA designation when purchasing. Rating life at 220 kN C assumes clean oil and adequate film; the 28.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 80 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "The NUP rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 140×33 mm envelope matches.", "If the shaft must be located both ways, do not use NUP2216EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The 220/243 kN ratings, 28.7 kN Pu and 2020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2216EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2216EA?", "a": "NUP2216EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 220 kN, C0 243 kN, Pu 28.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2020 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2216EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2216EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2216EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 95.3 mm, Ew 127.3 mm. The nominal bore/OD remain 80/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2216EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2216ea", "＊nup2216ea", "NUP2216EA" ], "locale_variants": {} }, { "sku": "N2316", "brand": "NTN", "manufacturer_designation": "NTN N2316", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 305, "static_load_kN": 330, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4200, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2316 denotes a 80×170×58 mm (3.15 × 6.693 × 2.283 in) cylindrical roller bearing in the N2300 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2316 designation when purchasing. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Do not replace N2316 with a deep-groove ball bearing on rating alone: line contact gives 305 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.", "The N rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×58 mm envelope matches.", "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The 305/330 kN ratings, 38 kN Pu and 5670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2316?", "a": "N2316 is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 305 kN, C0 330 kN, Pu 38 kN, grease limiting speed 3,600 r/min, oil 4,200 r/min, mass about 5670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2316 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2316 is supplied in the standard open execution shown in the table." }, { "q": "Can N2316 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2316", "N2316" ], "locale_variants": {} }, { "sku": "N2316E", "brand": "NTN", "manufacturer_designation": "NTN N2316E", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 5780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2316E on the 80×170 mm envelope, 58 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 3,300 r/min. Numbering ties N2316E to its envelope: type code N, series N2300, 80 mm bore; the 170×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 58 mm width and 45.0 mm section put the N2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats N2316E as a pure radial bearing: keep P below 395 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 80 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Open N2316E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "Open N2316E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 395/430 kN ratings, 49 kN Pu and 5780 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2316E?", "a": "N2316E is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 430 kN, Pu 49 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 5780 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2316E is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2316E is supplied in the standard open execution shown in the table." }, { "q": "Can N2316E take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2316e", "N2316E" ], "locale_variants": {} }, { "sku": "N316", "brand": "NTN", "manufacturer_designation": "NTN N316", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 207, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 80 mm shaft NTN supplies N316: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 4,100 r/min on grease and 4,800 r/min on oil. Numbering ties N316 to its envelope: type code N, series N300, 80 mm bore; the 170×39 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 211 kN and C0 207 kN (C0/C ≈ 0.98) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Mass 3770 g for the 80×170×39 mm N316 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of N316; an oversized radius locks the ring on its face and tilts the 39 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 39 mm-wide cavity.", "If the shaft must be located both ways, do not use N316 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 39 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N316 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The 211/207 kN ratings, 23.7 kN Pu and 3770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N316?", "a": "N316 is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 207 kN, Pu 23.7 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N316 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N316 is supplied in the standard open execution shown in the table." }, { "q": "Can N316 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N316-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n316", "N316" ], "locale_variants": {} }, { "sku": "N316E", "brand": "NTN", "manufacturer_designation": "NTN N316E", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 284, "static_load_kN": 282, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4400, "weight_g": 4120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N316E appears as a 80 mm bore single-row cylindrical roller bearing (284 kN C / 282 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Digit by digit, N316E reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 39 mm width and 45.0 mm section put the N300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 3.5 kN-per-mm-bore figure (284 kN over 80 mm) lets a N316E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N316E non-locating position preloads the bearing when the shaft grows.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 284/282 kN pair here belongs to N316E as printed, not to the bare size.", "The N rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×39 mm envelope matches.", "Grease limiting speed 3,700 r/min and oil 4,400 r/min are different limits for N316E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open N316E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 284/282 kN ratings, 32 kN Pu and 4120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N316E?", "a": "N316E is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 282 kN, Pu 32 kN, grease limiting speed 3,700 r/min, oil 4,400 r/min, mass about 4120 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N316E is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N316E is supplied in the standard open execution shown in the table." }, { "q": "Can N316E take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n316e", "N316E" ], "locale_variants": {} }, { "sku": "NF2316E", "brand": "NTN", "manufacturer_designation": "NTN NF2316E", "series": "NF2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 5780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2316E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 395 kN dynamic rating in the 80 mm bore. Digit by digit, NF2316E reads as NF (one rib on each ring), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 45.0 mm radial section ((170−80)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Selection arithmetic: Pu 49 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (430/395 kN) shows the high-static-capacity proportioning of this 80 mm bore. Heat the inner ring to max 120 °C for the 80 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NF2316E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NF2316E with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NF2316E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.", "The 395/430 kN ratings, 49 kN Pu and 5780 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2316E?", "a": "NF2316E is an NTN NF single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 430 kN, Pu 49 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 5780 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2316E is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF2316E is supplied in the standard open execution shown in the table." }, { "q": "Can NF2316E take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2316e", "NF2316E" ], "locale_variants": {} }, { "sku": "NF316", "brand": "NTN", "manufacturer_designation": "NTN NF316", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 207, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF316 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 80×170×39 mm ISO 15 envelope. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF316 floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF316 non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NF316: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 211/207 kN pair here belongs to NF316 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF316 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 211/207 kN pair here belongs to NF316 as printed, not to the bare size.", "The 211/207 kN ratings, 23.7 kN Pu and 3770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF316?", "a": "NF316 is an NTN NF single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 207 kN, Pu 23.7 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF316 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF316 is supplied in the standard open execution shown in the table." }, { "q": "Can NF316 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf316", "NF316" ], "locale_variants": {} }, { "sku": "NF316E", "brand": "NTN", "manufacturer_designation": "NTN NF316E", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 284, "static_load_kN": 282, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4400, "weight_g": 4120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF316E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 284 kN dynamic rating in the 80 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 32 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.99 (282/284 kN) shows the high-static-capacity proportioning of this 80 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF316E non-locating position preloads the bearing when the shaft grows.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Do not replace NF316E with a deep-groove ball bearing on rating alone: line contact gives 284 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NF316E with a deep-groove ball bearing on rating alone: line contact gives 284 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 39 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 284/282 kN pair here belongs to NF316E as printed, not to the bare size.", "The 284/282 kN ratings, 32 kN Pu and 4120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF316E?", "a": "NF316E is an NTN NF single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 282 kN, Pu 32 kN, grease limiting speed 3,700 r/min, oil 4,400 r/min, mass about 4120 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF316E is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF316E is supplied in the standard open execution shown in the table." }, { "q": "Can NF316E take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf316e", "NF316E" ], "locale_variants": {} }, { "sku": "NJ2316", "brand": "NTN", "manufacturer_designation": "NTN NJ2316", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 305, "static_load_kN": 330, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4200, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2316 is the extra-wide (23) section of the NTN NJ2300 dimension series for a 80 mm shaft — 305 kN of basic dynamic capacity in a 5670 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). With C 305 kN and C0 330 kN (C0/C ≈ 1.08) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Selection arithmetic: Pu 38 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.08 (330/305 kN) shows the high-static-capacity proportioning of this 80 mm bore. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 80 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2316 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "Open NJ2316 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "Grease limiting speed 3,600 r/min and oil 4,200 r/min are different limits for NJ2316: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2316 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The 305/330 kN ratings, 38 kN Pu and 5670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2316?", "a": "NJ2316 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 305 kN, C0 330 kN, Pu 38 kN, grease limiting speed 3,600 r/min, oil 4,200 r/min, mass about 5670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2316 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2316 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2316 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2316-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2316", "NJ2316" ], "locale_variants": {} }, { "sku": "NJ2316E", "brand": "NTN", "manufacturer_designation": "NTN NJ2316E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 5780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 80 mm shaft NTN supplies NJ2316E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,300 r/min on grease and 3,900 r/min on oil. Digit by digit, NJ2316E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 395 kN and C0 430 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Rating life at 395 kN C assumes clean oil and adequate film; the 49 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Do not replace NJ2316E with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NJ2316E with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 170×58 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2316E skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "The 395/430 kN ratings, 49 kN Pu and 5780 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2316E?", "a": "NJ2316E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 430 kN, Pu 49 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 5780 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2316E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2316E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2316E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2316e", "NJ2316E" ], "locale_variants": {} }, { "sku": "NJ316", "brand": "NTN", "manufacturer_designation": "NTN NJ316", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 207, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ316 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 211 kN dynamic rating in the 80 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 4,100 r/min is .85 of the 4,800 r/min oil value for NJ316; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ316; an oversized radius locks the ring on its face and tilts the 39 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NJ316 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NJ316 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 211/207 kN pair here belongs to NJ316 as printed, not to the bare size.", "The 211/207 kN ratings, 23.7 kN Pu and 3770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ316?", "a": "NJ316 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 207 kN, Pu 23.7 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ316 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ316 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ316 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ316-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj316", "NJ316" ], "locale_variants": {} }, { "sku": "NJ316E", "brand": "NTN", "manufacturer_designation": "NTN NJ316E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 284, "static_load_kN": 282, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4400, "weight_g": 4120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ316E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 284 kN dynamic rating in the 80 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 80 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 101 mm and Ew 151 mm — the envelope inside the 80/170 mm bore/OD where the rollers actually run. Rating life at 284 kN C assumes clean oil and adequate film; the 32 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Open NJ316E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "Grease limiting speed 3,700 r/min and oil 4,400 r/min are different limits for NJ316E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NJ316E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 170×39 mm envelope matches.", "The 284/282 kN ratings, 32 kN Pu and 4120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ316E?", "a": "NJ316E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 282 kN, Pu 32 kN, grease limiting speed 3,700 r/min, oil 4,400 r/min, mass about 4120 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ316E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ316E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ316E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj316e", "NJ316E" ], "locale_variants": {} }, { "sku": "NU2316", "brand": "NTN", "manufacturer_designation": "NTN NU2316", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 305, "static_load_kN": 330, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4200, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2316 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 305 kN dynamic rating in the 80 mm bore. Numbering ties NU2316 to its envelope: type code NU, series NU2300, 80 mm bore; the 170×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2316. Selection arithmetic: Pu 38 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.08 (330/305 kN) shows the high-static-capacity proportioning of this 80 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2316.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 305/330 kN pair here belongs to NU2316 as printed, not to the bare size.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.", "Grease limiting speed 3,600 r/min and oil 4,200 r/min are different limits for NU2316: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "The 305/330 kN ratings, 38 kN Pu and 5670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2316?", "a": "NU2316 is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 305 kN, C0 330 kN, Pu 38 kN, grease limiting speed 3,600 r/min, oil 4,200 r/min, mass about 5670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2316 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2316 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2316 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2316-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2316", "NU2316" ], "locale_variants": {} }, { "sku": "NU2316E", "brand": "NTN", "manufacturer_designation": "NTN NU2316E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 5780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2316E is the extra-wide (23) section of the NTN NU2300 dimension series for a 80 mm shaft — 395 kN of basic dynamic capacity in a 5780 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 170 mm OD and 58 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU2316E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 3,300 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 3,900 r/min for continuously high-duty 80 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Open NU2316E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NU2316E with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 395/430 kN ratings, 49 kN Pu and 5780 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2316E?", "a": "NU2316E is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 430 kN, Pu 49 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 5780 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2316E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2316E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2316E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2316e", "NU2316E" ], "locale_variants": {} }, { "sku": "NU316-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU316", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 207, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU316 appears as a 80 mm bore single-row cylindrical roller bearing (211 kN C / 207 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU316 floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU316 designation when purchasing. The 2.6 kN-per-mm-bore figure (211 kN over 80 mm) lets a NU316 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU316.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 80 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×39 mm envelope matches.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NU316: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 39 mm-wide cavity.", "The 39 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The 211/207 kN ratings, 23.7 kN Pu and 3770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU316?", "a": "NU316 is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 207 kN, Pu 23.7 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU316 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU316 is supplied in the standard open execution shown in the table." }, { "q": "Can NU316 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu316", "NU316", "NU316-NTN" ], "locale_variants": {} }, { "sku": "NU316E", "brand": "NTN", "manufacturer_designation": "NTN NU316E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 284, "static_load_kN": 282, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4400, "weight_g": 4120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU316E on the 80×170 mm envelope, 39 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 3,700 r/min. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 170 mm OD and 39 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU316E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 3,700 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 4,400 r/min for continuously high-duty 80 mm positions. Heat the inner ring to max 120 °C for the 80 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "The NU rib arrangement is not interchangeable with another prefix on the same 80 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×39 mm envelope matches.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 39 mm-wide cavity.", "Do not replace NU316E with a deep-groove ball bearing on rating alone: line contact gives 284 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 284/282 kN ratings, 32 kN Pu and 4120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU316E?", "a": "NU316E is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 282 kN, Pu 32 kN, grease limiting speed 3,700 r/min, oil 4,400 r/min, mass about 4120 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU316E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU316E is supplied in the standard open execution shown in the table." }, { "q": "Can NU316E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu316e", "NU316E" ], "locale_variants": {} }, { "sku": "NUP2316", "brand": "NTN", "manufacturer_designation": "NTN NUP2316", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 305, "static_load_kN": 330, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4200, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2316 appears as a 80 mm bore single-row cylindrical roller bearing (305 kN C / 330 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP2316 to its envelope: type code NUP, series NUP2300, 80 mm bore; the 170×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 45.0 mm radial section ((170−80)/2) frames the roller complement; capacity per millimetre of bore is about 3.8 kN/mm before application factors. The 80 mm (3.15 in) bore and 170 mm (6.693 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2316.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 305/330 kN pair here belongs to NUP2316 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2316 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "Do not replace NUP2316 with a deep-groove ball bearing on rating alone: line contact gives 305 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 45.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.", "The 305/330 kN ratings, 38 kN Pu and 5670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2316?", "a": "NUP2316 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 305 kN, C0 330 kN, Pu 38 kN, grease limiting speed 3,600 r/min, oil 4,200 r/min, mass about 5670 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2316 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2316 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2316 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2316-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2316", "NUP2316" ], "locale_variants": {} }, { "sku": "NUP2316E", "brand": "NTN", "manufacturer_designation": "NTN NUP2316E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 5780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2316E appears as a 80 mm bore single-row cylindrical roller bearing (395 kN C / 430 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2316E floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. With C 395 kN and C0 430 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 4.9 kN-per-mm-bore figure (395 kN over 80 mm) lets a NUP2316E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The NUP rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 170×58 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 395/430 kN pair here belongs to NUP2316E as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2316E skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "The 395/430 kN ratings, 49 kN Pu and 5780 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2316E?", "a": "NUP2316E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 430 kN, Pu 49 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 5780 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2316E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2316E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2316E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2316e", "NUP2316E" ], "locale_variants": {} }, { "sku": "NUP316", "brand": "NTN", "manufacturer_designation": "NTN NUP316", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 211, "static_load_kN": 207, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 3770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP316 on the 80×170 mm envelope, 39 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,100 r/min. Digit by digit, NUP316 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,800 r/min with oil versus 4,100 r/min with grease (a 700 r/min band), lubrication choice for NUP316 is a thermal decision, not just a sealing one. The 80 mm (3.15 in) bore and 170 mm (6.693 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 39 mm-wide ring. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 80 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NUP316: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NUP316 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NUP rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 170×39 mm envelope matches.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NUP316: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 211/207 kN ratings, 23.7 kN Pu and 3770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP316 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP316?", "a": "NUP316 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 211 kN, C0 207 kN, Pu 23.7 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 3770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP316 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP316 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP316 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP316?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 147 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP316-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup316", "NUP316" ], "locale_variants": {} }, { "sku": "NUP316E", "brand": "NTN", "manufacturer_designation": "NTN NUP316E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 284, "static_load_kN": 282, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4400, "weight_g": 4120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP316E on the 80×170 mm envelope, 39 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 3,700 r/min. Numbering ties NUP316E to its envelope: type code NUP, series NUP300, 80 mm bore; the 170×39 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 39 mm width and 45.0 mm section put the NUP300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NUP316E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 3,700 r/min and oil 4,400 r/min are different limits for NUP316E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 39 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Open NUP316E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 284/282 kN ratings, 32 kN Pu and 4120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP316E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP316E?", "a": "NUP316E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 284 kN, C0 282 kN, Pu 32 kN, grease limiting speed 3,700 r/min, oil 4,400 r/min, mass about 4120 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP316E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP316E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP316E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP316E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101 mm, Ew 151 mm. The nominal bore/OD remain 80/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP316E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup316e", "NUP316E" ], "locale_variants": {} }, { "sku": "N416", "brand": "NTN", "manufacturer_designation": "NTN N416", "series": "N400-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 315, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 7140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N416 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 330 kN dynamic rating in the 80 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N416 floats or locates; the numeric remainder is the ISO 15 series and 80 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N416 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats N416 as a pure radial bearing: keep P below 330 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of N416; an oversized radius locks the ring on its face and tilts the 48 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "If the shaft must be located both ways, do not use N416 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 330/315 kN pair here belongs to N416 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full N400 series code before substituting, because housing and shoulder geometry will not interchange.", "The 330/315 kN ratings, 34.5 kN Pu and 7140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N416 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N416?", "a": "N416 is an NTN N single-row cylindrical roller bearing to ISO 15: 80 mm bore, 200 mm OD and 48 mm width (3.15 × 7.874 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 315 kN, Pu 34.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 7140 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N416 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N416 is supplied in the standard open execution shown in the table." }, { "q": "Can N416 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N416?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 110 mm, Ew 170 mm. The nominal bore/OD remain 80/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N416", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n416", "N416" ], "locale_variants": {} }, { "sku": "NF416", "brand": "NTN", "manufacturer_designation": "NTN NF416", "series": "NF400-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 315, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 7140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF416 on the 80×200 mm envelope, 48 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Digit by digit, NF416 reads as NF (one rib on each ring), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NF416 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 330 kN C assumes clean oil and adequate film; the 34.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF416 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Open NF416 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "If the shaft must be located both ways, do not use NF416 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NF416 with a deep-groove ball bearing on rating alone: line contact gives 330 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 330/315 kN ratings, 34.5 kN Pu and 7140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF416 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF416?", "a": "NF416 is an NTN NF single-row cylindrical roller bearing to ISO 15: 80 mm bore, 200 mm OD and 48 mm width (3.15 × 7.874 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 315 kN, Pu 34.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 7140 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF416 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF416 is supplied in the standard open execution shown in the table." }, { "q": "Can NF416 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF416?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 110 mm, Ew 170 mm. The nominal bore/OD remain 80/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF416", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf416", "NF416" ], "locale_variants": {} }, { "sku": "NJ416-NTN", "brand": "NTN", "manufacturer_designation": "NTN NJ416", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 315, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 7140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ416 is the heavy (04) section of the NTN NJ400 dimension series for a 80 mm shaft — 330 kN of basic dynamic capacity in a 7140 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 80 mm, with 200 mm OD and 48 mm width from the ISO 15 general plan. The 60.0 mm radial section ((200−80)/2) frames the roller complement; capacity per millimetre of bore is about 4.1 kN/mm before application factors. Thermal planning around the 3,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,500 r/min for continuously high-duty 80 mm positions. Housing and shaft fillets must clear the ring chamfers of NJ416; an oversized radius locks the ring on its face and tilts the 48 mm-wide seat.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Open NJ416 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 80 mm contact.", "The NJ rib arrangement is not interchangeable with another prefix on the same 80 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 200×48 mm envelope matches.", "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "The 60.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 48 mm-wide cavity.", "The 330/315 kN ratings, 34.5 kN Pu and 7140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ416 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ416?", "a": "NJ416 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 80 mm bore, 200 mm OD and 48 mm width (3.15 × 7.874 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 315 kN, Pu 34.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 7140 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ416 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ416 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ416 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ416?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 110 mm, Ew 170 mm. The nominal bore/OD remain 80/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ416", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj416", "NJ416", "NJ416-NTN" ], "locale_variants": {} }, { "sku": "NU416-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU416", "series": "NU400-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 315, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 7140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU416 on the 80×200 mm envelope, 48 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Digit by digit, NU416 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 80 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU416. Speed ratio check: limiting 3,000 r/min is .86 of the 3,500 r/min oil value for NU416; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU416.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 80 mm inner ring.", "Wide (22/23) and light (10/49) executions at 80 mm bore share bore but not OD/width; check the full NU400 series code before substituting, because housing and shoulder geometry will not interchange.", "The NU rib arrangement is not interchangeable with another prefix on the same 80 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 200×48 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The 330/315 kN ratings, 34.5 kN Pu and 7140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU416 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU416?", "a": "NU416 is an NTN NU single-row cylindrical roller bearing to ISO 15: 80 mm bore, 200 mm OD and 48 mm width (3.15 × 7.874 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 315 kN, Pu 34.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 7140 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU416 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU416 is supplied in the standard open execution shown in the table." }, { "q": "Can NU416 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU416?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 110 mm, Ew 170 mm. The nominal bore/OD remain 80/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU416", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu416", "NU416", "NU416-NTN" ], "locale_variants": {} }, { "sku": "NUP416", "brand": "NTN", "manufacturer_designation": "NTN NUP416", "series": "NUP400-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 315, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 7140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 80 mm shaft NTN supplies NUP416: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,000 r/min on grease and 3,500 r/min on oil. Numbering ties NUP416 to its envelope: type code NUP, series NUP400, 80 mm bore; the 200×48 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 60.0 mm radial section ((200−80)/2) frames the roller complement; capacity per millimetre of bore is about 4.1 kN/mm before application factors. Rating life at 330 kN C assumes clean oil and adequate film; the 34.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 80 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 80 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 60.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 48 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 330/315 kN pair here belongs to NUP416 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 330/315 kN pair here belongs to NUP416 as printed, not to the bare size.", "The 60.0 mm section at 80 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 48 mm-wide cavity.", "The 330/315 kN ratings, 34.5 kN Pu and 7140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP416 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP416?", "a": "NUP416 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 80 mm bore, 200 mm OD and 48 mm width (3.15 × 7.874 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 315 kN, Pu 34.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 7140 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP416 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP416 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP416 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP416?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 110 mm, Ew 170 mm. The nominal bore/OD remain 80/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP416", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup416", "NUP416" ], "locale_variants": {} }, { "sku": "N1017", "brand": "NTN", "manufacturer_designation": "NTN N1017", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82.5, "static_load_kN": 95.5, "fatigue_load_limit_kN": 11.4, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N1017 on the 85×130 mm envelope, 22 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,400 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N1017 floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N1017 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 5,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 6,300 r/min for continuously high-duty 85 mm positions. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The 22.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "The 22 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "The 22.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 22 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 82.5/95.5 kN ratings, 11.4 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1017 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1017?", "a": "N1017 is an NTN N single-row cylindrical roller bearing to ISO 15: 85 mm bore, 130 mm OD and 22 mm width (3.346 × 5.118 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82.5 kN, C0 95.5 kN, Pu 11.4 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1010 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1017 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1017 is supplied in the standard open execution shown in the table." }, { "q": "Can N1017 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1017?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 96.5 mm, Ew 118.5 mm. The nominal bore/OD remain 85/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1017", "N1017" ], "locale_variants": {} }, { "sku": "NJ1017", "brand": "NTN", "manufacturer_designation": "NTN NJ1017", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82.5, "static_load_kN": 95.5, "fatigue_load_limit_kN": 11.4, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1017 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 85×130×22 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 130 mm OD and 22 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 5,400 r/min grease and 6,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 85 mm bore. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 85 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Do not replace NJ1017 with a deep-groove ball bearing on rating alone: line contact gives 82.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 130×22 mm envelope matches.", "Open NJ1017 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "If the shaft must be located both ways, do not use NJ1017 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 82.5/95.5 kN ratings, 11.4 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1017 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1017?", "a": "NJ1017 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 130 mm OD and 22 mm width (3.346 × 5.118 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82.5 kN, C0 95.5 kN, Pu 11.4 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1010 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1017 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1017 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1017 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1017?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 96.5 mm, Ew 118.5 mm. The nominal bore/OD remain 85/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1017-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1017", "NJ1017" ], "locale_variants": {} }, { "sku": "NN3017", "brand": "NTN", "manufacturer_designation": "NTN NN3017", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 135, "static_load_kN": 194, "fatigue_load_limit_kN": 23.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5600, "weight_g": 1610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3017 is the standard section of the NTN NN3000 dimension series for a 85 mm shaft — 135 kN of basic dynamic capacity in a 1610 g, open bearing. Digit by digit, NN3017 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NN3017 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 85 mm (3.346 in) bore and 130 mm (5.118 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 34 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3017.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The 34 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Do not replace NN3017 with a deep-groove ball bearing on rating alone: line contact gives 135 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3017 does not substitute a precision-class execution.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 135/194 kN ratings, 23.1 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3017 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3017?", "a": "NN3017 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 85 mm bore, 130 mm OD and 34 mm width (3.346 × 5.118 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 135 kN, C0 194 kN, Pu 23.1 kN, grease limiting speed 4,800 r/min, oil 5,600 r/min, mass about 1610 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3017 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3017 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3017?", "a": "NN3017 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3017?", "a": "NTN rates NN3017 at 4,800 r/min with grease and 5,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3017", "NN3017" ], "locale_variants": {} }, { "sku": "NN3017K", "brand": "NTN", "manufacturer_designation": "NTN NN3017K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 135, "static_load_kN": 194, "fatigue_load_limit_kN": 23.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5600, "weight_g": 1560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NN3017K on the 85×130 mm envelope, 34 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 4,800 r/min. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3017K floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Heat the inner ring to max 120 °C for the 85 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "Open NN3017K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 130 mm race brinells and releases as vibration within hours.", "The 34 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 135/194 kN pair here belongs to NN3017K as printed, not to the bare size.", "The 135/194 kN ratings, 23.1 kN Pu and 1560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3017K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3017K?", "a": "NN3017K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 85 mm bore, 130 mm OD and 34 mm width (3.346 × 5.118 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 135 kN, C0 194 kN, Pu 23.1 kN, grease limiting speed 4,800 r/min, oil 5,600 r/min, mass about 1560 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3017K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3017K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3017K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3017K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3017 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3017K?", "a": "NTN rates NN3017K at 4,800 r/min with grease and 5,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3017K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3017k", "NN3017K" ], "locale_variants": {} }, { "sku": "NU1017", "brand": "NTN", "manufacturer_designation": "NTN NU1017", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82.5, "static_load_kN": 95.5, "fatigue_load_limit_kN": 11.4, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1017 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 85 mm shaft — 82.5 kN of basic dynamic capacity in a 1010 g, open bearing. Digit by digit, NU1017 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 22 mm width and 22.5 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NU1017 as a pure radial bearing: keep P below 82.5 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1017.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 85 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 130×22 mm envelope matches.", "The 22 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Open NU1017 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "Open NU1017 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 82.5/95.5 kN ratings, 11.4 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1017 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1017?", "a": "NU1017 is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 130 mm OD and 22 mm width (3.346 × 5.118 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82.5 kN, C0 95.5 kN, Pu 11.4 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1010 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1017 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1017 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1017 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1017?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 96.5 mm, Ew 118.5 mm. The nominal bore/OD remain 85/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1017-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1017", "NU1017" ], "locale_variants": {} }, { "sku": "NUP1017", "brand": "NTN", "manufacturer_designation": "NTN NUP1017", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82.5, "static_load_kN": 95.5, "fatigue_load_limit_kN": 11.4, "limiting_speed_rpm": 5400, "max_rpm": 5400, "speed_oil_rpm": 6300, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1017 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 85 mm shaft — 82.5 kN of basic dynamic capacity in a 1010 g, open bearing. Digit by digit, NUP1017 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NUP1017 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 1.0 kN-per-mm-bore figure (82.5 kN over 85 mm) lets a NUP1017 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP1017; an oversized radius locks the ring on its face and tilts the 22 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 130 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 130×22 mm envelope matches.", "The NUP rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 130×22 mm envelope matches.", "The NUP rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 130×22 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 82.5/95.5 kN ratings, 11.4 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1017 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1017?", "a": "NUP1017 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 130 mm OD and 22 mm width (3.346 × 5.118 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 82.5 kN, C0 95.5 kN, Pu 11.4 kN, grease limiting speed 5,400 r/min, oil 6,300 r/min, mass about 1010 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1017 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1017 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1017 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1017?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 96.5 mm, Ew 118.5 mm. The nominal bore/OD remain 85/130 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,400 r/min grease / 6,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1017-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1017", "NUP1017" ], "locale_variants": {} }, { "sku": "N217", "brand": "NTN", "manufacturer_designation": "NTN N217", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 140, "fatigue_load_limit_kN": 16.3, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 5300, "weight_g": 1830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N217 is the standard section of the NTN N200 dimension series for a 85 mm shaft — 134 kN of basic dynamic capacity in a 1830 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N217 floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. The 32.5 mm radial section ((150−85)/2) frames the roller complement; capacity per millimetre of bore is about 1.6 kN/mm before application factors. Rating life at 134 kN C assumes clean oil and adequate film; the 16.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 85 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Grease limiting speed 4,500 r/min and oil 5,300 r/min are different limits for N217: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The 134/140 kN ratings, 16.3 kN Pu and 1830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N217?", "a": "N217 is an NTN N single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 140 kN, Pu 16.3 kN, grease limiting speed 4,500 r/min, oil 5,300 r/min, mass about 1830 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N217 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N217 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N217-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n217", "＊＊n217", "N217" ], "locale_variants": {} }, { "sku": "N217EA", "brand": "NTN", "manufacturer_designation": "NTN N217EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 198, "static_load_kN": 199, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 1930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N217EA is the standard section of the NTN N200 dimension series for a 85 mm shaft — 198 kN of basic dynamic capacity in a 1930 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 150 mm OD and 28 mm width from the ISO 15 general plan. At 5,800 r/min with oil versus 4,100 r/min with grease (a 1,700 r/min band), lubrication choice for N217EA is a thermal decision, not just a sealing one. Rating life at 198 kN C assumes clean oil and adequate film; the 23 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "If the shaft must be located both ways, do not use N217EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 4,100 r/min and oil 5,800 r/min are different limits for N217EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 198/199 kN ratings, 23 kN Pu and 1930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N217EA?", "a": "N217EA is an NTN N single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 198 kN, C0 199 kN, Pu 23 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 1930 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N217EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N217EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n217ea", "＊n217ea", "N217EA" ], "locale_variants": {} }, { "sku": "N2217", "brand": "NTN", "manufacturer_designation": "NTN N2217", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 188, "static_load_kN": 218, "fatigue_load_limit_kN": 25.3, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 85 mm shaft NTN supplies N2217: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 4,100 r/min on grease and 4,800 r/min on oil. Numbering ties N2217 to its envelope: type code N, series N2200, 85 mm bore; the 150×36 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N2217. Thermal planning around the 4,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,800 r/min for continuously high-duty 85 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 85 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "If the shaft must be located both ways, do not use N2217 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The N rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 150×36 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "The 188/218 kN ratings, 25.3 kN Pu and 2390 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2217?", "a": "N2217 is an NTN N single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 188 kN, C0 218 kN, Pu 25.3 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2390 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2217 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2217 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2217", "＊＊n2217", "N2217" ], "locale_variants": {} }, { "sku": "N2217EA", "brand": "NTN", "manufacturer_designation": "NTN N2217EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 257, "static_load_kN": 279, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 5200, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2217EA on the 85×150 mm envelope, 36 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,700 r/min. Digit by digit, N2217EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 32.5 mm radial section ((150−85)/2) frames the roller complement; capacity per millimetre of bore is about 3.0 kN/mm before application factors. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 85 mm shaft.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The N rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 150×36 mm envelope matches.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Grease limiting speed 3,700 r/min and oil 5,200 r/min are different limits for N2217EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 36 mm-wide cavity.", "The 257/279 kN ratings, 32.5 kN Pu and 2520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2217EA?", "a": "N2217EA is an NTN N single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 257 kN, C0 279 kN, Pu 32.5 kN, grease limiting speed 3,700 r/min, oil 5,200 r/min, mass about 2520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2217EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2217EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2217ea", "＊n2217ea", "N2217EA" ], "locale_variants": {} }, { "sku": "NF217", "brand": "NTN", "manufacturer_designation": "NTN NF217", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 140, "fatigue_load_limit_kN": 16.3, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 5300, "weight_g": 1830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF217 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 134 kN dynamic rating in the 85 mm bore. Digit by digit, NF217 reads as NF (one rib on each ring), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 28 mm width and 32.5 mm section put the NF200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 16.3 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.04 (140/134 kN) shows the high-static-capacity proportioning of this 85 mm bore. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 134/140 kN pair here belongs to NF217 as printed, not to the bare size.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NF217 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 134/140 kN ratings, 16.3 kN Pu and 1830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF217?", "a": "NF217 is an NTN NF single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 140 kN, Pu 16.3 kN, grease limiting speed 4,500 r/min, oil 5,300 r/min, mass about 1830 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF217 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF217 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf217", "＊＊nf217", "NF217" ], "locale_variants": {} }, { "sku": "NF217EA", "brand": "NTN", "manufacturer_designation": "NTN NF217EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 198, "static_load_kN": 199, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 1930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF217EA on the 85×150 mm envelope, 28 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 4,100 r/min. Digit by digit, NF217EA reads as NF (one rib on each ring), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 28 mm width and 32.5 mm section put the NF200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 23 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.01 (199/198 kN) shows the high-static-capacity proportioning of this 85 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF217EA.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Open NF217EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "If the shaft must be located both ways, do not use NF217EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NF217EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NF217EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 198/199 kN ratings, 23 kN Pu and 1930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF217EA?", "a": "NF217EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 198 kN, C0 199 kN, Pu 23 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 1930 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF217EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF217EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf217ea", "＊nf217ea", "NF217EA" ], "locale_variants": {} }, { "sku": "NF2217EA", "brand": "NTN", "manufacturer_designation": "NTN NF2217EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 257, "static_load_kN": 279, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 5200, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF2217EA denotes a 85×150×36 mm (3.346 × 5.906 × 1.417 in) cylindrical roller bearing in the NF2200 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF2217EA floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NF2217EA designation when purchasing. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF2217EA.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Open NF2217EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF2217EA skids at 3,700 r/min and fails by smearing long before L10 fatigue.", "Open NF2217EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "The 257/279 kN ratings, 32.5 kN Pu and 2520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2217EA?", "a": "NF2217EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 257 kN, C0 279 kN, Pu 32.5 kN, grease limiting speed 3,700 r/min, oil 5,200 r/min, mass about 2520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2217EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2217EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2217ea", "＊nf2217ea", "NF2217EA" ], "locale_variants": {} }, { "sku": "NJ217", "brand": "NTN", "manufacturer_designation": "NTN NJ217", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 140, "fatigue_load_limit_kN": 16.3, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 5300, "weight_g": 1830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ217 denotes a 85×150×28 mm (3.346 × 5.906 × 1.102 in) cylindrical roller bearing in the NJ200 family, a pressed sheet-steel cage. Digit by digit, NJ217 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 32.5 mm radial section ((150−85)/2) frames the roller complement; capacity per millimetre of bore is about 1.6 kN/mm before application factors. Rating life at 134 kN C assumes clean oil and adequate film; the 16.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 85 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Do not replace NJ217 with a deep-groove ball bearing on rating alone: line contact gives 134 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NJ217 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "If the shaft must be located both ways, do not use NJ217 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The 134/140 kN ratings, 16.3 kN Pu and 1830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ217?", "a": "NJ217 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 140 kN, Pu 16.3 kN, grease limiting speed 4,500 r/min, oil 5,300 r/min, mass about 1830 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ217 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ217 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ217-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj217", "＊＊nj217", "NJ217" ], "locale_variants": {} }, { "sku": "NJ217EA", "brand": "NTN", "manufacturer_designation": "NTN NJ217EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 198, "static_load_kN": 199, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 1930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ217EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 85×150×28 mm ISO 15 envelope. Digit by digit, NJ217EA reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 198 kN and C0 199 kN (C0/C ≈ 1.01) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 85 mm (3.346 in) bore and 150 mm (5.906 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 28 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 85 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NJ217EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ217EA skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The 198/199 kN ratings, 23 kN Pu and 1930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ217EA?", "a": "NJ217EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 198 kN, C0 199 kN, Pu 23 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 1930 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ217EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ217EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj217ea", "＊nj217ea", "NJ217EA" ], "locale_variants": {} }, { "sku": "NJ2217", "brand": "NTN", "manufacturer_designation": "NTN NJ2217", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 188, "static_load_kN": 218, "fatigue_load_limit_kN": 25.3, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2217 on the 85×150 mm envelope, 36 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,100 r/min. Digit by digit, NJ2217 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 32.5 mm radial section ((150−85)/2) frames the roller complement; capacity per millimetre of bore is about 2.2 kN/mm before application factors. Speed ratio check: limiting 4,100 r/min is .85 of the 4,800 r/min oil value for NJ2217; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 85 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The NJ rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 150×36 mm envelope matches.", "Do not replace NJ2217 with a deep-groove ball bearing on rating alone: line contact gives 188 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NJ2217 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 36 mm-wide cavity.", "The 188/218 kN ratings, 25.3 kN Pu and 2390 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2217?", "a": "NJ2217 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 188 kN, C0 218 kN, Pu 25.3 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2390 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2217 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2217 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2217-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2217", "＊＊nj2217", "NJ2217" ], "locale_variants": {} }, { "sku": "NJ2217EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2217EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 257, "static_load_kN": 279, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 5200, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2217EA is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 85×150×36 mm ISO 15 envelope. Numbering ties NJ2217EA to its envelope: type code NJ, series NJ2200, 85 mm bore; the 150×36 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NJ2217EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 2520 g for the 85×150×36 mm NJ2217EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 85 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 36 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Do not replace NJ2217EA with a deep-groove ball bearing on rating alone: line contact gives 257 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NJ2217EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 257/279 kN ratings, 32.5 kN Pu and 2520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2217EA?", "a": "NJ2217EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 257 kN, C0 279 kN, Pu 32.5 kN, grease limiting speed 3,700 r/min, oil 5,200 r/min, mass about 2520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2217EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2217EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2217ea", "＊nj2217ea", "NJ2217EA" ], "locale_variants": {} }, { "sku": "NU217-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU217", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 140, "fatigue_load_limit_kN": 16.3, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 5300, "weight_g": 1830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU217 appears as a 85 mm bore single-row cylindrical roller bearing (134 kN C / 140 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 150 mm OD and 28 mm width from the ISO 15 general plan. At 5,300 r/min with oil versus 4,500 r/min with grease (a 800 r/min band), lubrication choice for NU217 is a thermal decision, not just a sealing one. Thermal planning around the 4,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,300 r/min for continuously high-duty 85 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU217.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Grease limiting speed 4,500 r/min and oil 5,300 r/min are different limits for NU217: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 134/140 kN ratings, 16.3 kN Pu and 1830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU217?", "a": "NU217 is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 140 kN, Pu 16.3 kN, grease limiting speed 4,500 r/min, oil 5,300 r/min, mass about 1830 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU217 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU217 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu217", "＊＊nu217", "NU217", "NU217-NTN" ], "locale_variants": {} }, { "sku": "NU217EA", "brand": "NTN", "manufacturer_designation": "NTN NU217EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 198, "static_load_kN": 199, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 1930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU217EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 198 kN dynamic rating in the 85 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 150 mm OD and 28 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU217EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 198 kN C assumes clean oil and adequate film; the 23 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 85 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "Open NU217EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 198/199 kN pair here belongs to NU217EA as printed, not to the bare size.", "Do not replace NU217EA with a deep-groove ball bearing on rating alone: line contact gives 198 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 198/199 kN ratings, 23 kN Pu and 1930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU217EA?", "a": "NU217EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 198 kN, C0 199 kN, Pu 23 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 1930 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU217EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU217EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu217ea", "＊nu217ea", "NU217EA" ], "locale_variants": {} }, { "sku": "NU2217", "brand": "NTN", "manufacturer_designation": "NTN NU2217", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 188, "static_load_kN": 218, "fatigue_load_limit_kN": 25.3, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2217 denotes a 85×150×36 mm (3.346 × 5.906 × 1.417 in) cylindrical roller bearing in the NU2200 family, a pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 150 mm OD and 36 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 101.8 mm and Ew 133.8 mm — the envelope inside the 85/150 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2217 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NU2217: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NU2217: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NU rib arrangement is not interchangeable with another prefix on the same 85 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 150×36 mm envelope matches.", "The 188/218 kN ratings, 25.3 kN Pu and 2390 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2217?", "a": "NU2217 is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 188 kN, C0 218 kN, Pu 25.3 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2390 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2217 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2217 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2217-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2217", "＊＊nu2217", "NU2217" ], "locale_variants": {} }, { "sku": "NU2217EA", "brand": "NTN", "manufacturer_designation": "NTN NU2217EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 257, "static_load_kN": 279, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 5200, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2217EA is the wide (22) section of the NTN NU2200 dimension series for a 85 mm shaft — 257 kN of basic dynamic capacity in a 2520 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 85 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 3,700 r/min grease and 5,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 85 mm bore. Speed ratio check: limiting 3,700 r/min is .71 of the 5,200 r/min oil value for NU2217EA; grease-churn heating closes that gap as fill quantity rises. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 85 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 150×36 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NU2217EA with a deep-groove ball bearing on rating alone: line contact gives 257 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NU2217EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 257/279 kN ratings, 32.5 kN Pu and 2520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2217EA?", "a": "NU2217EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 257 kN, C0 279 kN, Pu 32.5 kN, grease limiting speed 3,700 r/min, oil 5,200 r/min, mass about 2520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2217EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2217EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2217ea", "＊nu2217ea", "NU2217EA" ], "locale_variants": {} }, { "sku": "NUP217", "brand": "NTN", "manufacturer_designation": "NTN NUP217", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 140, "fatigue_load_limit_kN": 16.3, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 5300, "weight_g": 1830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP217 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 134 kN dynamic rating in the 85 mm bore. Numbering ties NUP217 to its envelope: type code NUP, series NUP200, 85 mm bore; the 150×28 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 4,500 r/min grease and 5,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 85 mm bore. Selection arithmetic: Pu 16.3 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.04 (140/134 kN) shows the high-static-capacity proportioning of this 85 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP217; an oversized radius locks the ring on its face and tilts the 28 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP217 skids at 4,500 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 134/140 kN pair here belongs to NUP217 as printed, not to the bare size.", "The NUP rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 150×28 mm envelope matches.", "If the shaft must be located both ways, do not use NUP217 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 134/140 kN ratings, 16.3 kN Pu and 1830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP217?", "a": "NUP217 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 134 kN, C0 140 kN, Pu 16.3 kN, grease limiting speed 4,500 r/min, oil 5,300 r/min, mass about 1830 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP217 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP217 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,500 r/min grease / 5,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP217-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup217", "＊＊nup217", "NUP217" ], "locale_variants": {} }, { "sku": "NUP217EA", "brand": "NTN", "manufacturer_designation": "NTN NUP217EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 198, "static_load_kN": 199, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 5800, "weight_g": 1930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 85 mm shaft NTN supplies NUP217EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 4,100 r/min on grease and 5,800 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 85 mm (00–03 use the 10/12/15/17 exception table). With C 198 kN and C0 199 kN (C0/C ≈ 1.01) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 85 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP217EA skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP217EA skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP217EA skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The 198/199 kN ratings, 23 kN Pu and 1930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP217EA?", "a": "NUP217EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 28 mm width (3.346 × 5.906 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 198 kN, C0 199 kN, Pu 23 kN, grease limiting speed 4,100 r/min, oil 5,800 r/min, mass about 1930 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP217EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP217EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 5,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup217ea", "＊nup217ea", "NUP217EA" ], "locale_variants": {} }, { "sku": "NUP2217", "brand": "NTN", "manufacturer_designation": "NTN NUP2217", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 188, "static_load_kN": 218, "fatigue_load_limit_kN": 25.3, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2217 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 85×150×36 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 150 mm OD and 36 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP2217 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 25.3 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.16 (218/188 kN) shows the high-static-capacity proportioning of this 85 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2217 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NUP2217: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NUP2217: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NUP2217 with a deep-groove ball bearing on rating alone: line contact gives 188 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 188/218 kN ratings, 25.3 kN Pu and 2390 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2217 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2217?", "a": "NUP2217 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 188 kN, C0 218 kN, Pu 25.3 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2390 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2217 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2217 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2217 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2217?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 101.8 mm, Ew 133.8 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2217-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2217", "＊＊nup2217", "NUP2217" ], "locale_variants": {} }, { "sku": "NUP2217EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2217EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 257, "static_load_kN": 279, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 5200, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 85 mm shaft NTN supplies NUP2217EA: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,700 r/min on grease and 5,200 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2217EA floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 100.5 mm and Ew 136.5 mm — the envelope inside the 85/150 mm bore/OD where the rollers actually run. Mass 2520 g for the 85×150×36 mm NUP2217EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2217EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 32.5 mm section at 85 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 36 mm-wide cavity.", "Open NUP2217EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The NUP rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 150×36 mm envelope matches.", "The NUP rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 150×36 mm envelope matches.", "The 257/279 kN ratings, 32.5 kN Pu and 2520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2217EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2217EA?", "a": "NUP2217EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 257 kN, C0 279 kN, Pu 32.5 kN, grease limiting speed 3,700 r/min, oil 5,200 r/min, mass about 2520 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2217EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2217EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2217EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 100.5 mm, Ew 136.5 mm. The nominal bore/OD remain 85/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2217EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2217ea", "＊nup2217ea", "NUP2217EA" ], "locale_variants": {} }, { "sku": "N2317", "brand": "NTN", "manufacturer_designation": "NTN N2317", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 380, "fatigue_load_limit_kN": 43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 6570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2317 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 350 kN dynamic rating in the 85 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 180 mm OD and 60 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 6570 g for the 85×180×60 mm N2317 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 85 mm shaft.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The N rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 180×60 mm envelope matches.", "Do not replace N2317 with a deep-groove ball bearing on rating alone: line contact gives 350 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 350/380 kN pair here belongs to N2317 as printed, not to the bare size.", "The 350/380 kN ratings, 43 kN Pu and 6570 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2317?", "a": "N2317 is an NTN N single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 380 kN, Pu 43 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 6570 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2317 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2317 is supplied in the standard open execution shown in the table." }, { "q": "Can N2317 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2317", "N2317" ], "locale_variants": {} }, { "sku": "N317", "brand": "NTN", "manufacturer_designation": "NTN N317", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 235, "static_load_kN": 228, "fatigue_load_limit_kN": 25.6, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 4440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N317 denotes a 85×180×41 mm (3.346 × 7.087 × 1.614 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 85 mm (00–03 use the 10/12/15/17 exception table). The 41 mm width and 47.5 mm section put the N300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 3,900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,600 r/min for continuously high-duty 85 mm positions. Heat the inner ring to max 120 °C for the 85 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Do not replace N317 with a deep-groove ball bearing on rating alone: line contact gives 235 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 47.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 41 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Open N317 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 235/228 kN ratings, 25.6 kN Pu and 4440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N317?", "a": "N317 is an NTN N single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 228 kN, Pu 25.6 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 4440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N317 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N317 is supplied in the standard open execution shown in the table." }, { "q": "Can N317 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N317-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n317", "N317" ], "locale_variants": {} }, { "sku": "NF317", "brand": "NTN", "manufacturer_designation": "NTN NF317", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 235, "static_load_kN": 228, "fatigue_load_limit_kN": 25.6, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 4440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF317 appears as a 85 mm bore single-row cylindrical roller bearing (235 kN C / 228 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NF317 to its envelope: type code NF, series NF300, 85 mm bore; the 180×41 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 3,900 r/min grease and 4,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 85 mm bore. Mass 4440 g for the 85×180×41 mm NF317 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NF317; an oversized radius locks the ring on its face and tilts the 41 mm-wide seat.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NF317 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NF317 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 235/228 kN ratings, 25.6 kN Pu and 4440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF317?", "a": "NF317 is an NTN NF single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 228 kN, Pu 25.6 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 4440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF317 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF317 is supplied in the standard open execution shown in the table." }, { "q": "Can NF317 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf317", "NF317" ], "locale_variants": {} }, { "sku": "NJ2317", "brand": "NTN", "manufacturer_designation": "NTN NJ2317", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 380, "fatigue_load_limit_kN": 43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 6570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 85 mm shaft NTN supplies NJ2317: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,400 r/min on grease and 4,000 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 180 mm OD and 60 mm width from the ISO 15 general plan. The 60 mm width and 47.5 mm section put the NJ2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 350 kN C assumes clean oil and adequate film; the 43 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2317.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The 47.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for NJ2317: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Open NJ2317 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 350/380 kN ratings, 43 kN Pu and 6570 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2317?", "a": "NJ2317 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 380 kN, Pu 43 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 6570 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2317 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2317 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2317 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2317-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2317", "NJ2317" ], "locale_variants": {} }, { "sku": "NJ2317E", "brand": "NTN", "manufacturer_designation": "NTN NJ2317E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 435, "static_load_kN": 485, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2317E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 85×180×60 mm ISO 15 envelope. Numbering ties NJ2317E to its envelope: type code NJ, series NJ2300, 85 mm bore; the 180×60 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 108 mm — the envelope inside the 85/180 mm bore/OD where the rollers actually run. Thermal planning around the 3,100 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 3,700 r/min for continuously high-duty 85 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 85 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "If the shaft must be located both ways, do not use NJ2317E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 47.5 mm section at 85 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.", "The 47.5 mm section at 85 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.", "The NJ rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 180×60 mm envelope matches.", "The 435/485 kN ratings, 54 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2317E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2317E?", "a": "NJ2317E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 485 kN, Pu 54 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2317E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2317E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2317E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2317E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2317E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2317e", "NJ2317E" ], "locale_variants": {} }, { "sku": "NJ317", "brand": "NTN", "manufacturer_designation": "NTN NJ317", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 235, "static_load_kN": 228, "fatigue_load_limit_kN": 25.6, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 4440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ317 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 85×180×41 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 180 mm OD and 41 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,900 r/min grease and 4,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 85 mm bore. The 2.8 kN-per-mm-bore figure (235 kN over 85 mm) lets a NJ317 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 85 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The NJ rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 180×41 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ317 skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "The 47.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 41 mm-wide cavity.", "If the shaft must be located both ways, do not use NJ317 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 235/228 kN ratings, 25.6 kN Pu and 4440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ317?", "a": "NJ317 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 228 kN, Pu 25.6 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 4440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ317 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ317 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ317 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ317-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj317", "NJ317" ], "locale_variants": {} }, { "sku": "NJ317E", "brand": "NTN", "manufacturer_designation": "NTN NJ317E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 330, "fatigue_load_limit_kN": 37, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ317E on the 85×180 mm envelope, 41 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 3,500 r/min. Digit by digit, NJ317E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 85 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,500 r/min grease and 4,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 85 mm bore. Rating life at 325 kN C assumes clean oil and adequate film; the 37 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ317E non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Do not replace NJ317E with a deep-groove ball bearing on rating alone: line contact gives 325 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NJ317E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NJ317E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 325/330 kN ratings, 37 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ317E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ317E?", "a": "NJ317E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 330 kN, Pu 37 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ317E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ317E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ317E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ317E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ317E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj317e", "NJ317E" ], "locale_variants": {} }, { "sku": "NU2317", "brand": "NTN", "manufacturer_designation": "NTN NU2317", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 380, "fatigue_load_limit_kN": 43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 6570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2317 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 85×180×60 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 85 mm (00–03 use the 10/12/15/17 exception table). The 47.5 mm radial section ((180−85)/2) frames the roller complement; capacity per millimetre of bore is about 4.1 kN/mm before application factors. Rating life at 350 kN C assumes clean oil and adequate film; the 43 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2317 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Open NU2317 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The NU rib arrangement is not interchangeable with another prefix on the same 85 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 180×60 mm envelope matches.", "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "The 47.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.", "The 350/380 kN ratings, 43 kN Pu and 6570 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2317?", "a": "NU2317 is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 380 kN, Pu 43 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 6570 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2317 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2317 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2317 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2317-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2317", "NU2317" ], "locale_variants": {} }, { "sku": "NU2317E", "brand": "NTN", "manufacturer_designation": "NTN NU2317E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 435, "static_load_kN": 485, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2317E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 435 kN dynamic rating in the 85 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2317E floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. The 60 mm width and 47.5 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 54 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.11 (485/435 kN) shows the high-static-capacity proportioning of this 85 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 85 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Do not replace NU2317E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 3,100 r/min and oil 3,700 r/min are different limits for NU2317E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Open NU2317E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 435/485 kN ratings, 54 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2317E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2317E?", "a": "NU2317E is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 485 kN, Pu 54 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2317E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2317E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2317E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2317E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2317E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2317e", "NU2317E" ], "locale_variants": {} }, { "sku": "NU317-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU317", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 235, "static_load_kN": 228, "fatigue_load_limit_kN": 25.6, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 4440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU317 on the 85×180 mm envelope, 41 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,900 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 85 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Mass 4440 g for the 85×180×41 mm NU317 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU317.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Grease limiting speed 3,900 r/min and oil 4,600 r/min are different limits for NU317: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU317 skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 235/228 kN pair here belongs to NU317 as printed, not to the bare size.", "The 235/228 kN ratings, 25.6 kN Pu and 4440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU317?", "a": "NU317 is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 228 kN, Pu 25.6 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 4440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU317 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU317 is supplied in the standard open execution shown in the table." }, { "q": "Can NU317 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu317", "NU317", "NU317-NTN" ], "locale_variants": {} }, { "sku": "NU317E", "brand": "NTN", "manufacturer_designation": "NTN NU317E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 330, "fatigue_load_limit_kN": 37, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU317E denotes a 85×180×41 mm (3.346 × 7.087 × 1.614 in) cylindrical roller bearing in the NU300 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU317E floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. The 41 mm width and 47.5 mm section put the NU300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 37 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.02 (330/325 kN) shows the high-static-capacity proportioning of this 85 mm bore. Housing and shaft fillets must clear the ring chamfers of NU317E; an oversized radius locks the ring on its face and tilts the 41 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The NU rib arrangement is not interchangeable with another prefix on the same 85 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 180×41 mm envelope matches.", "If the shaft must be located both ways, do not use NU317E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NU317E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU317E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "The 325/330 kN ratings, 37 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU317E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU317E?", "a": "NU317E is an NTN NU single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 330 kN, Pu 37 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU317E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU317E is supplied in the standard open execution shown in the table." }, { "q": "Can NU317E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU317E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU317E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu317e", "NU317E" ], "locale_variants": {} }, { "sku": "NUP2317", "brand": "NTN", "manufacturer_designation": "NTN NUP2317", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 380, "fatigue_load_limit_kN": 43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 6570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2317 on the 85×180 mm envelope, 60 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 85 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2317 designation when purchasing. Speed ratio check: limiting 3,400 r/min is .85 of the 4,000 r/min oil value for NUP2317; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2317 non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Open NUP2317 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 85 mm contact.", "If the shaft must be located both ways, do not use NUP2317 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 350/380 kN pair here belongs to NUP2317 as printed, not to the bare size.", "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "The 350/380 kN ratings, 43 kN Pu and 6570 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2317?", "a": "NUP2317 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 380 kN, Pu 43 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 6570 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2317 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2317 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2317 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2317-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2317", "NUP2317" ], "locale_variants": {} }, { "sku": "NUP2317E", "brand": "NTN", "manufacturer_designation": "NTN NUP2317E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 435, "static_load_kN": 485, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 85 mm shaft NTN supplies NUP2317E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,100 r/min on grease and 3,700 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 85 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 108 mm — the envelope inside the 85/180 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 85 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NUP2317E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NUP2317E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The NUP rib arrangement is not interchangeable with another prefix on the same 85 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 180×60 mm envelope matches.", "The 435/485 kN ratings, 54 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2317E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2317E?", "a": "NUP2317E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 485 kN, Pu 54 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2317E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2317E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2317E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2317E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2317E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2317e", "NUP2317E" ], "locale_variants": {} }, { "sku": "NUP317", "brand": "NTN", "manufacturer_designation": "NTN NUP317", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 235, "static_load_kN": 228, "fatigue_load_limit_kN": 25.6, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 4440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP317 is the standard section of the NTN NUP300 dimension series for a 85 mm shaft — 235 kN of basic dynamic capacity in a 4440 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP317 floats or locates; the numeric remainder is the ISO 15 series and 85 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP317 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 3,900 r/min is .85 of the 4,600 r/min oil value for NUP317; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP317.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 47.5 mm section at 85 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 41 mm-wide cavity.", "Do not replace NUP317 with a deep-groove ball bearing on rating alone: line contact gives 235 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NUP317 with a deep-groove ball bearing on rating alone: line contact gives 235 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 235/228 kN ratings, 25.6 kN Pu and 4440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP317 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP317?", "a": "NUP317 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 228 kN, Pu 25.6 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 4440 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP317 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP317 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP317 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP317?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 156 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP317-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup317", "NUP317" ], "locale_variants": {} }, { "sku": "NUP317E", "brand": "NTN", "manufacturer_designation": "NTN NUP317E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 330, "fatigue_load_limit_kN": 37, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP317E denotes a 85×180×41 mm (3.346 × 7.087 × 1.614 in) cylindrical roller bearing in the NUP300 family, the high-capacity pressed-steel cage of the E execution. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 85 mm, with 180 mm OD and 41 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP317E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 3,500 r/min is .85 of the 4,100 r/min oil value for NUP317E; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 85 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 85 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The 41 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 85 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "Grease limiting speed 3,500 r/min and oil 4,100 r/min are different limits for NUP317E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 85 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 325/330 kN ratings, 37 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP317E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP317E?", "a": "NUP317E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 330 kN, Pu 37 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP317E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP317E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP317E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP317E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm. The nominal bore/OD remain 85/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP317E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup317e", "NUP317E" ], "locale_variants": {} }, { "sku": "N1018", "brand": "NTN", "manufacturer_designation": "NTN N1018", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 5900, "weight_g": 1310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1018 is the extra-light (10/49) section of the NTN N1000 dimension series for a 90 mm shaft — 98 kN of basic dynamic capacity in a 1310 g, open bearing. Numbering ties N1018 to its envelope: type code N, series N1000, 90 mm bore; the 140×24 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N1018. The 90 mm (3.543 in) bore and 140 mm (5.512 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 24 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 90 mm shaft.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Do not replace N1018 with a deep-groove ball bearing on rating alone: line contact gives 98 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The N rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×24 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 98/114 kN ratings, 13.4 kN Pu and 1310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1018 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1018?", "a": "N1018 is an NTN N single-row cylindrical roller bearing to ISO 15: 90 mm bore, 140 mm OD and 24 mm width (3.543 × 5.512 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 114 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 5,900 r/min, mass about 1310 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1018 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1018 is supplied in the standard open execution shown in the table." }, { "q": "Can N1018 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1018?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 127 mm. The nominal bore/OD remain 90/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1018", "N1018" ], "locale_variants": {} }, { "sku": "NJ1018", "brand": "NTN", "manufacturer_designation": "NTN NJ1018", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 5900, "weight_g": 1310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1018 appears as a 90 mm bore single-row cylindrical roller bearing (98 kN C / 114 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ1018 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 5,900 r/min with oil versus 5,100 r/min with grease (a 800 r/min band), lubrication choice for NJ1018 is a thermal decision, not just a sealing one. Mass 1310 g for the 90×140×24 mm NJ1018 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1018.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Do not replace NJ1018 with a deep-groove ball bearing on rating alone: line contact gives 98 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 5,100 r/min and oil 5,900 r/min are different limits for NJ1018: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 5,100 r/min and oil 5,900 r/min are different limits for NJ1018: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 98/114 kN ratings, 13.4 kN Pu and 1310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1018 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1018?", "a": "NJ1018 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 140 mm OD and 24 mm width (3.543 × 5.512 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 114 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 5,900 r/min, mass about 1310 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1018 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1018 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1018 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1018?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 127 mm. The nominal bore/OD remain 90/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1018-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1018", "NJ1018" ], "locale_variants": {} }, { "sku": "NN3018", "brand": "NTN", "manufacturer_designation": "NTN NN3018", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 158, "static_load_kN": 228, "fatigue_load_limit_kN": 26.6, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 5300, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 90 mm shaft NTN supplies NN3018: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,500 r/min on grease and 5,300 r/min on oil. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3018 floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3018. Speed ratio check: limiting 4,500 r/min is .85 of the 5,300 r/min oil value for NN3018; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3018 non-locating position preloads the bearing when the shaft grows.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3018 skids at 4,500 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 158/228 kN pair here belongs to NN3018 as printed, not to the bare size.", "The 25.0 mm section at 90 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 158/228 kN ratings, 26.6 kN Pu and 2070 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3018 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3018?", "a": "NN3018 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 90 mm bore, 140 mm OD and 37 mm width (3.543 × 5.512 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 158 kN, C0 228 kN, Pu 26.6 kN, grease limiting speed 4,500 r/min, oil 5,300 r/min, mass about 2070 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3018 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3018 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3018?", "a": "NN3018 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3018?", "a": "NTN rates NN3018 at 4,500 r/min with grease and 5,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3018", "NN3018" ], "locale_variants": {} }, { "sku": "NN3018K", "brand": "NTN", "manufacturer_designation": "NTN NN3018K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 158, "static_load_kN": 228, "fatigue_load_limit_kN": 26.6, "limiting_speed_rpm": 4500, "max_rpm": 4500, "speed_oil_rpm": 5300, "weight_g": 2010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN3018K denotes a 90×140×37 mm (3.543 × 5.512 × 1.457 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). At 5,300 r/min with oil versus 4,500 r/min with grease (a 800 r/min band), lubrication choice for NN3018K is a thermal decision, not just a sealing one. Speed ratio check: limiting 4,500 r/min is .85 of the 5,300 r/min oil value for NN3018K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NN3018K; an oversized radius locks the ring on its face and tilts the 37 mm-wide seat.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "Do not replace NN3018K with a deep-groove ball bearing on rating alone: line contact gives 158 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NN3018K with a deep-groove ball bearing on rating alone: line contact gives 158 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 4,500 r/min and oil 5,300 r/min are different limits for NN3018K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 4,500 r/min and oil 5,300 r/min are different limits for NN3018K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 158/228 kN ratings, 26.6 kN Pu and 2010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3018K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3018K?", "a": "NN3018K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 90 mm bore, 140 mm OD and 37 mm width (3.543 × 5.512 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 158 kN, C0 228 kN, Pu 26.6 kN, grease limiting speed 4,500 r/min, oil 5,300 r/min, mass about 2010 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3018K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3018K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3018K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3018K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3018 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3018K?", "a": "NTN rates NN3018K at 4,500 r/min with grease and 5,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3018K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3018k", "NN3018K" ], "locale_variants": {} }, { "sku": "NU1018", "brand": "NTN", "manufacturer_designation": "NTN NU1018", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 5900, "weight_g": 1310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 90 mm shaft NTN supplies NU1018: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 5,100 r/min on grease and 5,900 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1018 floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 103 mm and Ew 127 mm — the envelope inside the 90/140 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1018 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98/114 kN pair here belongs to NU1018 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 5,100 r/min and oil 5,900 r/min are different limits for NU1018: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NU rib arrangement is not interchangeable with another prefix on the same 90 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 140×24 mm envelope matches.", "The 98/114 kN ratings, 13.4 kN Pu and 1310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1018 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1018?", "a": "NU1018 is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 140 mm OD and 24 mm width (3.543 × 5.512 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 114 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 5,900 r/min, mass about 1310 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1018 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1018 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1018 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1018?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 127 mm. The nominal bore/OD remain 90/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1018-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1018", "NU1018" ], "locale_variants": {} }, { "sku": "NUP1018", "brand": "NTN", "manufacturer_designation": "NTN NUP1018", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "limiting_speed_rpm": 5100, "max_rpm": 5100, "speed_oil_rpm": 5900, "weight_g": 1310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 90 mm shaft NTN supplies NUP1018: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,100 r/min on grease and 5,900 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1018 floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP1018. Selection arithmetic: Pu 13.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.16 (114/98 kN) shows the high-static-capacity proportioning of this 90 mm bore. Heat the inner ring to max 120 °C for the 90 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 98/114 kN pair here belongs to NUP1018 as printed, not to the bare size.", "Do not replace NUP1018 with a deep-groove ball bearing on rating alone: line contact gives 98 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NUP1018 with a deep-groove ball bearing on rating alone: line contact gives 98 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "The 98/114 kN ratings, 13.4 kN Pu and 1310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1018 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1018?", "a": "NUP1018 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 140 mm OD and 24 mm width (3.543 × 5.512 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 114 kN, Pu 13.4 kN, grease limiting speed 5,100 r/min, oil 5,900 r/min, mass about 1310 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1018 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1018 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1018 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1018?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 103 mm, Ew 127 mm. The nominal bore/OD remain 90/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 5,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1018", "NUP1018" ], "locale_variants": {} }, { "sku": "N218", "brand": "NTN", "manufacturer_designation": "NTN N218", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 169, "static_load_kN": 178, "fatigue_load_limit_kN": 20.3, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 90 mm shaft NTN supplies N218: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 4,300 r/min on grease and 5,000 r/min on oil. Numbering ties N218 to its envelope: type code N, series N200, 90 mm bore; the 160×30 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full N218 designation when purchasing. Equivalent-load planning treats N218 as a pure radial bearing: keep P below 169 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N218.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "If the shaft must be located both ways, do not use N218 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 30 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The 30 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The 169/178 kN ratings, 20.3 kN Pu and 2250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N218?", "a": "N218 is an NTN N single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 178 kN, Pu 20.3 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2250 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N218 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N218 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N218-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n218", "＊＊n218", "N218" ], "locale_variants": {} }, { "sku": "N218EA", "brand": "NTN", "manufacturer_designation": "NTN N218EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 215, "static_load_kN": 217, "fatigue_load_limit_kN": 24.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N218EA denotes a 90×160×30 mm (3.543 × 6.299 × 1.181 in) cylindrical roller bearing in the N200 family, the EA high-capacity pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N218EA floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. The 35.0 mm radial section ((160−90)/2) frames the roller complement; capacity per millimetre of bore is about 2.4 kN/mm before application factors. Thermal planning around the 3,900 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 5,500 r/min for continuously high-duty 90 mm positions. Housing and shaft fillets must clear the ring chamfers of N218EA; an oversized radius locks the ring on its face and tilts the 30 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Do not replace N218EA with a deep-groove ball bearing on rating alone: line contact gives 215 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The N rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 160×30 mm envelope matches.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 30 mm-wide cavity.", "The 215/217 kN ratings, 24.7 kN Pu and 2370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N218EA?", "a": "N218EA is an NTN N single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 215 kN, C0 217 kN, Pu 24.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2370 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N218EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N218EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n218ea", "＊n218ea", "N218EA" ], "locale_variants": {} }, { "sku": "N2218", "brand": "NTN", "manufacturer_designation": "NTN N2218", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 219, "static_load_kN": 248, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 3040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2218 denotes a 90×160×40 mm (3.543 × 6.299 × 1.575 in) cylindrical roller bearing in the N2200 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). The 35.0 mm radial section ((160−90)/2) frames the roller complement; capacity per millimetre of bore is about 2.4 kN/mm before application factors. The 90 mm (3.543 in) bore and 160 mm (6.299 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 40 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2218.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The N rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 160×40 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2218 skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "Do not replace N2218 with a deep-groove ball bearing on rating alone: line contact gives 219 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 219/248 kN ratings, 28.3 kN Pu and 3040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2218?", "a": "N2218 is an NTN N single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 219 kN, C0 248 kN, Pu 28.3 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 3040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2218 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N2218 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2218", "＊＊n2218", "N2218" ], "locale_variants": {} }, { "sku": "N2218EA", "brand": "NTN", "manufacturer_designation": "NTN N2218EA", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 286, "static_load_kN": 315, "fatigue_load_limit_kN": 35.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 90 mm shaft NTN supplies N2218EA: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 3,500 r/min on grease and 4,900 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 90 mm, with 160 mm OD and 40 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,500 r/min grease and 4,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 90 mm bore. Rating life at 286 kN C assumes clean oil and adequate film; the 35.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 90 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "If the shaft must be located both ways, do not use N2218EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 286/315 kN ratings, 35.5 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2218EA?", "a": "N2218EA is an NTN N single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 315 kN, Pu 35.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 3200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2218EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N2218EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2218ea", "＊n2218ea", "N2218EA" ], "locale_variants": {} }, { "sku": "NF218", "brand": "NTN", "manufacturer_designation": "NTN NF218", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 169, "static_load_kN": 178, "fatigue_load_limit_kN": 20.3, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF218 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 90×160×30 mm ISO 15 envelope. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF218 floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 107 mm and Ew 143 mm — the envelope inside the 90/160 mm bore/OD where the rollers actually run. Rating life at 169 kN C assumes clean oil and adequate film; the 20.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 90 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Open NF218 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 90 mm contact.", "The NF rib arrangement is not interchangeable with another prefix on the same 90 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 160×30 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF218 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "The NF rib arrangement is not interchangeable with another prefix on the same 90 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 160×30 mm envelope matches.", "The 169/178 kN ratings, 20.3 kN Pu and 2250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF218?", "a": "NF218 is an NTN NF single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 178 kN, Pu 20.3 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2250 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF218 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF218 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf218", "＊＊nf218", "NF218" ], "locale_variants": {} }, { "sku": "NF218EA", "brand": "NTN", "manufacturer_designation": "NTN NF218EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 215, "static_load_kN": 217, "fatigue_load_limit_kN": 24.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 90 mm shaft NTN supplies NF218EA: one integral rib on each ring; the open execution is rated 3,900 r/min on grease and 5,500 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 90 mm, with 160 mm OD and 30 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,900 r/min grease and 5,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 90 mm bore. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 90 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 215/217 kN pair here belongs to NF218EA as printed, not to the bare size.", "The NF rib arrangement is not interchangeable with another prefix on the same 90 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 160×30 mm envelope matches.", "If the shaft must be located both ways, do not use NF218EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 215/217 kN ratings, 24.7 kN Pu and 2370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF218EA?", "a": "NF218EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 215 kN, C0 217 kN, Pu 24.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2370 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF218EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF218EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf218ea", "＊nf218ea", "NF218EA" ], "locale_variants": {} }, { "sku": "NF2218EA", "brand": "NTN", "manufacturer_designation": "NTN NF2218EA", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 286, "static_load_kN": 315, "fatigue_load_limit_kN": 35.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2218EA is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 90×160×40 mm ISO 15 envelope. Digit by digit, NF2218EA reads as NF (one rib on each ring), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,900 r/min with oil versus 3,500 r/min with grease (a 1,400 r/min band), lubrication choice for NF2218EA is a thermal decision, not just a sealing one. Rating life at 286 kN C assumes clean oil and adequate film; the 35.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF2218EA.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Do not replace NF2218EA with a deep-groove ball bearing on rating alone: line contact gives 286 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 3,500 r/min and oil 4,900 r/min are different limits for NF2218EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 3,500 r/min and oil 4,900 r/min are different limits for NF2218EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 286/315 kN ratings, 35.5 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2218EA?", "a": "NF2218EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 315 kN, Pu 35.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 3200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2218EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF2218EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2218ea", "＊nf2218ea", "NF2218EA" ], "locale_variants": {} }, { "sku": "NJ218", "brand": "NTN", "manufacturer_designation": "NTN NJ218", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 169, "static_load_kN": 178, "fatigue_load_limit_kN": 20.3, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ218 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 169 kN dynamic rating in the 90 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ218 floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ218 designation when purchasing. Equivalent-load planning treats NJ218 as a pure radial bearing: keep P below 169 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 90 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Grease limiting speed 4,300 r/min and oil 5,000 r/min are different limits for NJ218: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 30 mm-wide cavity.", "The 30 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The 169/178 kN ratings, 20.3 kN Pu and 2250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ218?", "a": "NJ218 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 178 kN, Pu 20.3 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2250 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ218 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ218 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ218-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj218", "＊＊nj218", "NJ218" ], "locale_variants": {} }, { "sku": "NJ218EA", "brand": "NTN", "manufacturer_designation": "NTN NJ218EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 215, "static_load_kN": 217, "fatigue_load_limit_kN": 24.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ218EA on the 90×160 mm envelope, 30 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,900 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 90 mm, with 160 mm OD and 30 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NJ218EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 2370 g for the 90×160×30 mm NJ218EA execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 90 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 30 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 215/217 kN pair here belongs to NJ218EA as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 215/217 kN ratings, 24.7 kN Pu and 2370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ218EA?", "a": "NJ218EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 215 kN, C0 217 kN, Pu 24.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2370 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ218EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ218EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj218ea", "＊nj218ea", "NJ218EA" ], "locale_variants": {} }, { "sku": "NJ2218", "brand": "NTN", "manufacturer_designation": "NTN NJ2218", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 219, "static_load_kN": 248, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 3040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2218 is the wide (22) section of the NTN NJ2200 dimension series for a 90 mm shaft — 219 kN of basic dynamic capacity in a 3040 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2218 floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ2218 designation when purchasing. The 2.4 kN-per-mm-bore figure (219 kN over 90 mm) lets a NJ2218 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 90 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 219/248 kN pair here belongs to NJ2218 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 219/248 kN pair here belongs to NJ2218 as printed, not to the bare size.", "Grease limiting speed 3,900 r/min and oil 4,600 r/min are different limits for NJ2218: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The 219/248 kN ratings, 28.3 kN Pu and 3040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2218?", "a": "NJ2218 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 219 kN, C0 248 kN, Pu 28.3 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 3040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2218 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ2218 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2218-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2218", "＊＊nj2218", "NJ2218" ], "locale_variants": {} }, { "sku": "NJ2218EA", "brand": "NTN", "manufacturer_designation": "NTN NJ2218EA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 286, "static_load_kN": 315, "fatigue_load_limit_kN": 35.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2218EA on the 90×160 mm envelope, 40 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,500 r/min. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2218EA floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. EA marks the high-capacity design: optimised roller complement in a pressed (stamped) sheet-steel cage for more load capacity than the basic number in the same ISO 15 envelope; the ＊ symbol printed before the number in 2203E marks the ULTAGE new-generation specification — upgraded material/geometry and longer rating life, not part of the order code; quote the full NJ2218EA designation when purchasing. Equivalent-load planning treats NJ2218EA as a pure radial bearing: keep P below 286 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 90 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Grease limiting speed 3,500 r/min and oil 4,900 r/min are different limits for NJ2218EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 3,500 r/min and oil 4,900 r/min are different limits for NJ2218EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The 286/315 kN ratings, 35.5 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2218EA?", "a": "NJ2218EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 315 kN, Pu 35.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 3200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2218EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ2218EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2218ea", "＊nj2218ea", "NJ2218EA" ], "locale_variants": {} }, { "sku": "NU218-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU218", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 169, "static_load_kN": 178, "fatigue_load_limit_kN": 20.3, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU218 on the 90×160 mm envelope, 30 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,300 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU218 floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NU218 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 169 kN C assumes clean oil and adequate film; the 20.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU218.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Open NU218 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 90 mm contact.", "If the shaft must be located both ways, do not use NU218 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Do not replace NU218 with a deep-groove ball bearing on rating alone: line contact gives 169 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 169/178 kN ratings, 20.3 kN Pu and 2250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU218?", "a": "NU218 is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 178 kN, Pu 20.3 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2250 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU218 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU218 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu218", "＊＊nu218", "NU218", "NU218-NTN" ], "locale_variants": {} }, { "sku": "NU218EA", "brand": "NTN", "manufacturer_designation": "NTN NU218EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 215, "static_load_kN": 217, "fatigue_load_limit_kN": 24.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU218EA appears as a 90 mm bore single-row cylindrical roller bearing (215 kN C / 217 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 107 mm and Ew 145 mm — the envelope inside the 90/160 mm bore/OD where the rollers actually run. The 2.4 kN-per-mm-bore figure (215 kN over 90 mm) lets a NU218EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 90 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "If the shaft must be located both ways, do not use NU218EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU218EA skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The NU rib arrangement is not interchangeable with another prefix on the same 90 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 160×30 mm envelope matches.", "The 215/217 kN ratings, 24.7 kN Pu and 2370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU218EA?", "a": "NU218EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 215 kN, C0 217 kN, Pu 24.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2370 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU218EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU218EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu218ea", "＊nu218ea", "NU218EA" ], "locale_variants": {} }, { "sku": "NU2218", "brand": "NTN", "manufacturer_designation": "NTN NU2218", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 219, "static_load_kN": 248, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 3040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2218 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 219 kN dynamic rating in the 90 mm bore. Digit by digit, NU2218 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NU2218 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 3040 g for the 90×160×40 mm NU2218 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NU2218; an oversized radius locks the ring on its face and tilts the 40 mm-wide seat.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2218 skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 219/248 kN ratings, 28.3 kN Pu and 3040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2218?", "a": "NU2218 is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 219 kN, C0 248 kN, Pu 28.3 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 3040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2218 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU2218 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2218-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2218", "＊＊nu2218", "NU2218" ], "locale_variants": {} }, { "sku": "NU2218EA", "brand": "NTN", "manufacturer_designation": "NTN NU2218EA", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 286, "static_load_kN": 315, "fatigue_load_limit_kN": 35.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2218EA denotes a 90×160×40 mm (3.543 × 6.299 × 1.575 in) cylindrical roller bearing in the NU2200 family, the EA high-capacity pressed sheet-steel cage. Numbering ties NU2218EA to its envelope: type code NU, series NU2200, 90 mm bore; the 160×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 286 kN and C0 315 kN (C0/C ≈ 1.10) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 3,500 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 4,900 r/min for continuously high-duty 90 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 90 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 160×40 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 286/315 kN pair here belongs to NU2218EA as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2218EA skids at 3,500 r/min and fails by smearing long before L10 fatigue.", "The 286/315 kN ratings, 35.5 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2218EA?", "a": "NU2218EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 315 kN, Pu 35.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 3200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2218EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU2218EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2218ea", "＊nu2218ea", "NU2218EA" ], "locale_variants": {} }, { "sku": "NUP218", "brand": "NTN", "manufacturer_designation": "NTN NUP218", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 169, "static_load_kN": 178, "fatigue_load_limit_kN": 20.3, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP218 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 90×160×30 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). At 5,000 r/min with oil versus 4,300 r/min with grease (a 700 r/min band), lubrication choice for NUP218 is a thermal decision, not just a sealing one. Rating life at 169 kN C assumes clean oil and adequate film; the 20.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 90 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 30 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Do not replace NUP218 with a deep-groove ball bearing on rating alone: line contact gives 169 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 4,300 r/min and oil 5,000 r/min are different limits for NUP218: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 169/178 kN ratings, 20.3 kN Pu and 2250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP218?", "a": "NUP218 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 178 kN, Pu 20.3 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2250 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP218 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP218 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP218-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup218", "＊＊nup218", "NUP218" ], "locale_variants": {} }, { "sku": "NUP218EA", "brand": "NTN", "manufacturer_designation": "NTN NUP218EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 215, "static_load_kN": 217, "fatigue_load_limit_kN": 24.7, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 5500, "weight_g": 2370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP218EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 215 kN dynamic rating in the 90 mm bore. Digit by digit, NUP218EA reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NUP218EA high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NUP218EA as a pure radial bearing: keep P below 215 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 90 mm shaft.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 160×30 mm envelope matches.", "Do not replace NUP218EA with a deep-groove ball bearing on rating alone: line contact gives 215 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NUP218EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 215/217 kN ratings, 24.7 kN Pu and 2370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP218EA?", "a": "NUP218EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 30 mm width (3.543 × 6.299 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 215 kN, C0 217 kN, Pu 24.7 kN, grease limiting speed 3,900 r/min, oil 5,500 r/min, mass about 2370 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP218EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP218EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 5,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup218ea", "＊nup218ea", "NUP218EA" ], "locale_variants": {} }, { "sku": "NUP2218", "brand": "NTN", "manufacturer_designation": "NTN NUP2218", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 219, "static_load_kN": 248, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 3040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2218 appears as a 90 mm bore single-row cylindrical roller bearing (219 kN C / 248 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP2218 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2218. Rating life at 219 kN C assumes clean oil and adequate film; the 28.3 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NUP2218; an oversized radius locks the ring on its face and tilts the 40 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 219/248 kN pair here belongs to NUP2218 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 219/248 kN ratings, 28.3 kN Pu and 3040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2218 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2218?", "a": "NUP2218 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 219 kN, C0 248 kN, Pu 28.3 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 3040 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2218 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2218 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP2218 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2218?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 143 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2218-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2218", "＊＊nup2218", "NUP2218" ], "locale_variants": {} }, { "sku": "NUP2218EA", "brand": "NTN", "manufacturer_designation": "NTN NUP2218EA", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 286, "static_load_kN": 315, "fatigue_load_limit_kN": 35.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4900, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2218EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 286 kN dynamic rating in the 90 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). The 35.0 mm radial section ((160−90)/2) frames the roller complement; capacity per millimetre of bore is about 3.2 kN/mm before application factors. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2218EA non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Open NUP2218EA units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 90 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2218EA skids at 3,500 r/min and fails by smearing long before L10 fatigue.", "Do not replace NUP2218EA with a deep-groove ball bearing on rating alone: line contact gives 286 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 35.0 mm section at 90 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 286/315 kN ratings, 35.5 kN Pu and 3200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2218EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2218EA?", "a": "NUP2218EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 315 kN, Pu 35.5 kN, grease limiting speed 3,500 r/min, oil 4,900 r/min, mass about 3200 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2218EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP2218EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2218EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 107 mm, Ew 145 mm. The nominal bore/OD remain 90/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2218EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2218ea", "＊nup2218ea", "NUP2218EA" ], "locale_variants": {} }, { "sku": "N2318", "brand": "NTN", "manufacturer_designation": "NTN N2318", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 360, "static_load_kN": 395, "fatigue_load_limit_kN": 43.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 7790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2318 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 90×190×64 mm ISO 15 envelope. Digit by digit, N2318 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,200 r/min grease and 3,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 90 mm bore. Thermal planning around the 3,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,800 r/min for continuously high-duty 90 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2318.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Grease limiting speed 3,200 r/min and oil 3,800 r/min are different limits for N2318: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace N2318 with a deep-groove ball bearing on rating alone: line contact gives 360 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 360/395 kN pair here belongs to N2318 as printed, not to the bare size.", "If the shaft must be located both ways, do not use N2318 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 360/395 kN ratings, 43.5 kN Pu and 7790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2318?", "a": "N2318 is an NTN N single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 360 kN, C0 395 kN, Pu 43.5 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 7790 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2318 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2318 is supplied in the standard open execution shown in the table." }, { "q": "Can N2318 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2318", "N2318" ], "locale_variants": {} }, { "sku": "N318", "brand": "NTN", "manufacturer_designation": "NTN N318", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 265, "fatigue_load_limit_kN": 29.3, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4300, "weight_g": 5180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N318 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 266 kN dynamic rating in the 90 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 90 mm, with 190 mm OD and 43 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 115 mm and Ew 165 mm — the envelope inside the 90/190 mm bore/OD where the rollers actually run. The 90 mm (3.543 in) bore and 190 mm (7.48 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 43 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 90 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "The N rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 190×43 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N318 skids at 3,700 r/min and fails by smearing long before L10 fatigue.", "The N rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 190×43 mm envelope matches.", "The 266/265 kN ratings, 29.3 kN Pu and 5180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N318?", "a": "N318 is an NTN N single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 265 kN, Pu 29.3 kN, grease limiting speed 3,700 r/min, oil 4,300 r/min, mass about 5180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N318 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N318 is supplied in the standard open execution shown in the table." }, { "q": "Can N318 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N318-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n318", "N318" ], "locale_variants": {} }, { "sku": "NF318", "brand": "NTN", "manufacturer_designation": "NTN NF318", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 265, "fatigue_load_limit_kN": 29.3, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4300, "weight_g": 5180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF318 on the 90×190 mm envelope, 43 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,700 r/min. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). At 4,300 r/min with oil versus 3,700 r/min with grease (a 600 r/min band), lubrication choice for NF318 is a thermal decision, not just a sealing one. Thermal planning around the 3,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,300 r/min for continuously high-duty 90 mm positions. Heat the inner ring to max 120 °C for the 90 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "If the shaft must be located both ways, do not use NF318 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NF318 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 90 mm contact.", "The 50.0 mm section at 90 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "Grease limiting speed 3,700 r/min and oil 4,300 r/min are different limits for NF318: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 266/265 kN ratings, 29.3 kN Pu and 5180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF318?", "a": "NF318 is an NTN NF single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 265 kN, Pu 29.3 kN, grease limiting speed 3,700 r/min, oil 4,300 r/min, mass about 5180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF318 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF318 is supplied in the standard open execution shown in the table." }, { "q": "Can NF318 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf318", "NF318" ], "locale_variants": {} }, { "sku": "NJ2318", "brand": "NTN", "manufacturer_designation": "NTN NJ2318", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 360, "static_load_kN": 395, "fatigue_load_limit_kN": 43.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 7790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2318 denotes a 90×190×64 mm (3.543 × 7.48 × 2.52 in) cylindrical roller bearing in the NJ2300 family, a pressed sheet-steel cage. Digit by digit, NJ2318 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 115 mm and Ew 165 mm — the envelope inside the 90/190 mm bore/OD where the rollers actually run. Equivalent-load planning treats NJ2318 as a pure radial bearing: keep P below 360 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2318 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Do not replace NJ2318 with a deep-groove ball bearing on rating alone: line contact gives 360 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NJ rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 190×64 mm envelope matches.", "The 360/395 kN ratings, 43.5 kN Pu and 7790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2318?", "a": "NJ2318 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 360 kN, C0 395 kN, Pu 43.5 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 7790 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2318 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2318 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2318 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2318-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2318", "NJ2318" ], "locale_variants": {} }, { "sku": "NJ2318E", "brand": "NTN", "manufacturer_designation": "NTN NJ2318E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 485, "static_load_kN": 535, "fatigue_load_limit_kN": 58.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2318E is the extra-wide (23) section of the NTN NJ2300 dimension series for a 90 mm shaft — 485 kN of basic dynamic capacity in a open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 90 mm, with 190 mm OD and 64 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2318E. Selection arithmetic: Pu 58.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.10 (535/485 kN) shows the high-static-capacity proportioning of this 90 mm bore. Heat the inner ring to max 120 °C for the 90 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2318E skids at 2,900 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NJ2318E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "The 485/535 kN ratings, 58.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2318E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2318E?", "a": "NJ2318E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 485 kN, C0 535 kN, Pu 58.5 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2318E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2318E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2318E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2318E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2318E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2318e", "NJ2318E" ], "locale_variants": {} }, { "sku": "NJ318", "brand": "NTN", "manufacturer_designation": "NTN NJ318", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 265, "fatigue_load_limit_kN": 29.3, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4300, "weight_g": 5180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ318 appears as a 90 mm bore single-row cylindrical roller bearing (266 kN C / 265 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ318 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,300 r/min with oil versus 3,700 r/min with grease (a 600 r/min band), lubrication choice for NJ318 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 29.3 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.00 (265/266 kN) shows the high-static-capacity proportioning of this 90 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 90 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 266/265 kN pair here belongs to NJ318 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NJ318 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 190×43 mm envelope matches.", "Grease limiting speed 3,700 r/min and oil 4,300 r/min are different limits for NJ318: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 266/265 kN ratings, 29.3 kN Pu and 5180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ318?", "a": "NJ318 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 265 kN, Pu 29.3 kN, grease limiting speed 3,700 r/min, oil 4,300 r/min, mass about 5180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ318 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ318 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ318 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ318-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj318", "NJ318" ], "locale_variants": {} }, { "sku": "NJ318E", "brand": "NTN", "manufacturer_designation": "NTN NJ318E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 355, "fatigue_load_limit_kN": 39, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ318E denotes a 90×190×43 mm (3.543 × 7.48 × 1.693 in) cylindrical roller bearing in the NJ300 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NJ318E to its envelope: type code NJ, series NJ300, 90 mm bore; the 190×43 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NJ318E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 3,300 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 3,900 r/min for continuously high-duty 90 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ318E.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "If the shaft must be located both ways, do not use NJ318E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NJ318E with a deep-groove ball bearing on rating alone: line contact gives 350 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ318E skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "Do not replace NJ318E with a deep-groove ball bearing on rating alone: line contact gives 350 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 350/355 kN ratings, 39 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ318E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ318E?", "a": "NJ318E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 355 kN, Pu 39 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ318E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ318E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ318E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ318E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ318E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj318e", "NJ318E" ], "locale_variants": {} }, { "sku": "NU2318", "brand": "NTN", "manufacturer_designation": "NTN NU2318", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 360, "static_load_kN": 395, "fatigue_load_limit_kN": 43.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 7790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2318 appears as a 90 mm bore single-row cylindrical roller bearing (360 kN C / 395 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 90 mm, with 190 mm OD and 64 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU2318 designation when purchasing. Equivalent-load planning treats NU2318 as a pure radial bearing: keep P below 360 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU2318; an oversized radius locks the ring on its face and tilts the 64 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "Do not replace NU2318 with a deep-groove ball bearing on rating alone: line contact gives 360 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The 360/395 kN ratings, 43.5 kN Pu and 7790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2318?", "a": "NU2318 is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 360 kN, C0 395 kN, Pu 43.5 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 7790 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2318 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2318 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2318 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2318-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2318", "NU2318" ], "locale_variants": {} }, { "sku": "NU2318E", "brand": "NTN", "manufacturer_designation": "NTN NU2318E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 485, "static_load_kN": 535, "fatigue_load_limit_kN": 58.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2318E on the 90×190 mm envelope, 64 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,900 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NU2318E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass Dimensions 90×190×64 mm and the 485 kN C rating define the substitution envelope; check the 2203E mass column for this exact NU2318E execution. Heat the inner ring to max 120 °C for the 90 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "If the shaft must be located both ways, do not use NU2318E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "Grease limiting speed 2,900 r/min and oil 3,400 r/min are different limits for NU2318E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 485/535 kN ratings, 58.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2318E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2318E?", "a": "NU2318E is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 485 kN, C0 535 kN, Pu 58.5 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2318E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2318E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2318E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2318E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2318E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2318e", "NU2318E" ], "locale_variants": {} }, { "sku": "NU318-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU318", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 265, "fatigue_load_limit_kN": 29.3, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4300, "weight_g": 5180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU318 is the standard section of the NTN NU300 dimension series for a 90 mm shaft — 266 kN of basic dynamic capacity in a 5180 g, open bearing. Digit by digit, NU318 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,700 r/min grease and 4,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 90 mm bore. Selection arithmetic: Pu 29.3 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.00 (265/266 kN) shows the high-static-capacity proportioning of this 90 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU318.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The 50.0 mm section at 90 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "The NU rib arrangement is not interchangeable with another prefix on the same 90 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 190×43 mm envelope matches.", "Open NU318 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 90 mm contact.", "If the shaft must be located both ways, do not use NU318 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 266/265 kN ratings, 29.3 kN Pu and 5180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU318?", "a": "NU318 is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 265 kN, Pu 29.3 kN, grease limiting speed 3,700 r/min, oil 4,300 r/min, mass about 5180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU318 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU318 is supplied in the standard open execution shown in the table." }, { "q": "Can NU318 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu318", "NU318", "NU318-NTN" ], "locale_variants": {} }, { "sku": "NU318E", "brand": "NTN", "manufacturer_designation": "NTN NU318E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 355, "fatigue_load_limit_kN": 39, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU318E appears as a 90 mm bore single-row cylindrical roller bearing (350 kN C / 355 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 90 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NU318E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass Dimensions 90×190×43 mm and the 350 kN C rating define the substitution envelope; check the 2203E mass column for this exact NU318E execution. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU318E non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU318E skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU318E skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 350/355 kN ratings, 39 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU318E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU318E?", "a": "NU318E is an NTN NU single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 355 kN, Pu 39 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU318E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU318E is supplied in the standard open execution shown in the table." }, { "q": "Can NU318E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU318E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU318E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu318e", "NU318E" ], "locale_variants": {} }, { "sku": "NUP2318", "brand": "NTN", "manufacturer_designation": "NTN NUP2318", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 360, "static_load_kN": 395, "fatigue_load_limit_kN": 43.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 7790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2318 is the extra-wide (23) section of the NTN NUP2300 dimension series for a 90 mm shaft — 360 kN of basic dynamic capacity in a 7790 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 90 mm, with 190 mm OD and 64 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 4.0 kN-per-mm-bore figure (360 kN over 90 mm) lets a NUP2318 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP2318; an oversized radius locks the ring on its face and tilts the 64 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 90 mm inner ring.", "The 50.0 mm section at 90 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 360/395 kN pair here belongs to NUP2318 as printed, not to the bare size.", "The 360/395 kN ratings, 43.5 kN Pu and 7790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2318?", "a": "NUP2318 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 360 kN, C0 395 kN, Pu 43.5 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 7790 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2318 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2318 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2318 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2318-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2318", "NUP2318" ], "locale_variants": {} }, { "sku": "NUP2318E", "brand": "NTN", "manufacturer_designation": "NTN NUP2318E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 485, "static_load_kN": 535, "fatigue_load_limit_kN": 58.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2318E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 90×190×64 mm ISO 15 envelope. Digit by digit, NUP2318E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2318E. Speed ratio check: limiting 2,900 r/min is .85 of the 3,400 r/min oil value for NUP2318E; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 90 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 190×64 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 90 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NUP rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 190×64 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "The 485/535 kN ratings, 58.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2318E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2318E?", "a": "NUP2318E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 485 kN, C0 535 kN, Pu 58.5 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2318E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2318E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2318E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2318E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2318E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2318e", "NUP2318E" ], "locale_variants": {} }, { "sku": "NUP318", "brand": "NTN", "manufacturer_designation": "NTN NUP318", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 265, "fatigue_load_limit_kN": 29.3, "limiting_speed_rpm": 3700, "max_rpm": 3700, "speed_oil_rpm": 4300, "weight_g": 5180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 90 mm shaft NTN supplies NUP318: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,700 r/min on grease and 4,300 r/min on oil. Numbering ties NUP318 to its envelope: type code NUP, series NUP300, 90 mm bore; the 190×43 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 266 kN and C0 265 kN (C0/C ≈ 1.00) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 3.0 kN-per-mm-bore figure (266 kN over 90 mm) lets a NUP318 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP318 non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "If the shaft must be located both ways, do not use NUP318 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NUP rib arrangement is not interchangeable with another prefix on the same 90 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 190×43 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 266/265 kN pair here belongs to NUP318 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP318 skids at 3,700 r/min and fails by smearing long before L10 fatigue.", "The 266/265 kN ratings, 29.3 kN Pu and 5180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP318 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP318?", "a": "NUP318 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 265 kN, Pu 29.3 kN, grease limiting speed 3,700 r/min, oil 4,300 r/min, mass about 5180 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP318 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP318 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP318 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP318?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 115 mm, Ew 165 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,700 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP318-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup318", "NUP318" ], "locale_variants": {} }, { "sku": "NUP318E", "brand": "NTN", "manufacturer_designation": "NTN NUP318E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 355, "fatigue_load_limit_kN": 39, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP318E appears as a 90 mm bore single-row cylindrical roller bearing (350 kN C / 355 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP318E floats or locates; the numeric remainder is the ISO 15 series and 90 mm bore reference, not a fit or clearance instruction. The 50.0 mm radial section ((190−90)/2) frames the roller complement; capacity per millimetre of bore is about 3.9 kN/mm before application factors. Equivalent-load planning treats NUP318E as a pure radial bearing: keep P below 350 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 90 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 90 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "Do not replace NUP318E with a deep-groove ball bearing on rating alone: line contact gives 350 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Open NUP318E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 90 mm contact.", "The 50.0 mm section at 90 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "The 350/355 kN ratings, 39 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP318E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP318E?", "a": "NUP318E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 355 kN, Pu 39 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP318E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP318E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP318E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP318E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm. The nominal bore/OD remain 90/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP318E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup318e", "NUP318E" ], "locale_variants": {} }, { "sku": "N1019", "brand": "NTN", "manufacturer_designation": "NTN N1019", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 101, "static_load_kN": 120, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5600, "weight_g": 1380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 95 mm shaft NTN supplies N1019: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 4,800 r/min on grease and 5,600 r/min on oil. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). The 25.0 mm radial section ((145−95)/2) frames the roller complement; capacity per millimetre of bore is about 1.1 kN/mm before application factors. Speed ratio check: limiting 4,800 r/min is .86 of the 5,600 r/min oil value for N1019; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1019.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 145 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1019 skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "Do not replace N1019 with a deep-groove ball bearing on rating alone: line contact gives 101 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 25.0 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 24 mm-wide cavity.", "The 101/120 kN ratings, 13.9 kN Pu and 1380 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1019 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1019?", "a": "N1019 is an NTN N single-row cylindrical roller bearing to ISO 15: 95 mm bore, 145 mm OD and 24 mm width (3.74 × 5.709 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 101 kN, C0 120 kN, Pu 13.9 kN, grease limiting speed 4,800 r/min, oil 5,600 r/min, mass about 1380 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1019 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1019 is supplied in the standard open execution shown in the table." }, { "q": "Can N1019 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1019?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 132 mm. The nominal bore/OD remain 95/145 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1019", "N1019" ], "locale_variants": {} }, { "sku": "NJ1019", "brand": "NTN", "manufacturer_designation": "NTN NJ1019", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 101, "static_load_kN": 120, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5600, "weight_g": 1380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ1019 on the 95×145 mm envelope, 24 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,800 r/min. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1019 floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NJ1019 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 4,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,600 r/min for continuously high-duty 95 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1019 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "Grease limiting speed 4,800 r/min and oil 5,600 r/min are different limits for NJ1019: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 101/120 kN pair here belongs to NJ1019 as printed, not to the bare size.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "Do not replace NJ1019 with a deep-groove ball bearing on rating alone: line contact gives 101 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 101/120 kN ratings, 13.9 kN Pu and 1380 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1019 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1019?", "a": "NJ1019 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 145 mm OD and 24 mm width (3.74 × 5.709 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 101 kN, C0 120 kN, Pu 13.9 kN, grease limiting speed 4,800 r/min, oil 5,600 r/min, mass about 1380 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1019 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1019 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1019 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1019?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 132 mm. The nominal bore/OD remain 95/145 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1019", "NJ1019" ], "locale_variants": {} }, { "sku": "NN3019", "brand": "NTN", "manufacturer_designation": "NTN NN3019", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 162, "static_load_kN": 238, "fatigue_load_limit_kN": 27.4, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN3019 denotes a 95×145×37 mm (3.74 × 5.709 × 1.457 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Numbering ties NN3019 to its envelope: type code NN, series NN3000, 95 mm bore; the 145×37 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 25.0 mm radial section ((145−95)/2) frames the roller complement; capacity per millimetre of bore is about 1.7 kN/mm before application factors. The 1.7 kN-per-mm-bore figure (162 kN over 95 mm) lets a NN3019 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NN3019; an oversized radius locks the ring on its face and tilts the 37 mm-wide seat.", "applications": [ "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "The 25.0 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 145 mm race brinells and releases as vibration within hours.", "The NN rib arrangement is not interchangeable with another prefix on the same 95 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 145×37 mm envelope matches.", "The 25.0 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "The 162/238 kN ratings, 27.4 kN Pu and 2170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3019 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3019?", "a": "NN3019 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 95 mm bore, 145 mm OD and 37 mm width (3.74 × 5.709 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 238 kN, Pu 27.4 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2170 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3019 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3019 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3019?", "a": "NN3019 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3019?", "a": "NTN rates NN3019 at 4,300 r/min with grease and 5,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3019", "NN3019" ], "locale_variants": {} }, { "sku": "NN3019K", "brand": "NTN", "manufacturer_designation": "NTN NN3019K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 162, "static_load_kN": 238, "fatigue_load_limit_kN": 27.4, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5000, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3019K appears as a 95 mm bore single-row cylindrical roller bearing (162 kN C / 238 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Digit by digit, NN3019K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 162 kN and C0 238 kN (C0/C ≈ 1.47) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Equivalent-load planning treats NN3019K as a pure radial bearing: keep P below 162 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3019K non-locating position preloads the bearing when the shaft grows.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "The K tapered bore of NN3019K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "The 25.0 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "Open NN3019K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3019K skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "The 162/238 kN ratings, 27.4 kN Pu and 2100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3019K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3019K?", "a": "NN3019K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 95 mm bore, 145 mm OD and 37 mm width (3.74 × 5.709 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 162 kN, C0 238 kN, Pu 27.4 kN, grease limiting speed 4,300 r/min, oil 5,000 r/min, mass about 2100 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3019K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3019K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3019K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3019K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3019 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3019K?", "a": "NTN rates NN3019K at 4,300 r/min with grease and 5,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3019K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3019k", "NN3019K" ], "locale_variants": {} }, { "sku": "NU1019", "brand": "NTN", "manufacturer_designation": "NTN NU1019", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 101, "static_load_kN": 120, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5600, "weight_g": 1380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU1019 denotes a 95×145×24 mm (3.74 × 5.709 × 0.945 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. Numbering ties NU1019 to its envelope: type code NU, series NU1000, 95 mm bore; the 145×24 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NU1019 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 1380 g for the 95×145×24 mm NU1019 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NU1019; an oversized radius locks the ring on its face and tilts the 24 mm-wide seat.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "Open NU1019 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1019 skids at 4,800 r/min and fails by smearing long before L10 fatigue.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 101/120 kN ratings, 13.9 kN Pu and 1380 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1019 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1019?", "a": "NU1019 is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 145 mm OD and 24 mm width (3.74 × 5.709 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 101 kN, C0 120 kN, Pu 13.9 kN, grease limiting speed 4,800 r/min, oil 5,600 r/min, mass about 1380 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1019 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1019 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1019 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1019?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 132 mm. The nominal bore/OD remain 95/145 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1019-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1019", "NU1019" ], "locale_variants": {} }, { "sku": "NUP1019", "brand": "NTN", "manufacturer_designation": "NTN NUP1019", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 101, "static_load_kN": 120, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "speed_oil_rpm": 5600, "weight_g": 1380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP1019 denotes a 95×145×24 mm (3.74 × 5.709 × 0.945 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. Numbering ties NUP1019 to its envelope: type code NUP, series NUP1000, 95 mm bore; the 145×24 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 25.0 mm radial section ((145−95)/2) frames the roller complement; capacity per millimetre of bore is about 1.1 kN/mm before application factors. Rating life at 101 kN C assumes clean oil and adequate film; the 13.9 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 95 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "Open NUP1019 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 101/120 kN pair here belongs to NUP1019 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 101/120 kN pair here belongs to NUP1019 as printed, not to the bare size.", "The 25.0 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 24 mm-wide cavity.", "The 101/120 kN ratings, 13.9 kN Pu and 1380 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1019 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1019?", "a": "NUP1019 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 145 mm OD and 24 mm width (3.74 × 5.709 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 101 kN, C0 120 kN, Pu 13.9 kN, grease limiting speed 4,800 r/min, oil 5,600 r/min, mass about 1380 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1019 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1019 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1019 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1019?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 108 mm, Ew 132 mm. The nominal bore/OD remain 95/145 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,800 r/min grease / 5,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1019", "NUP1019" ], "locale_variants": {} }, { "sku": "N219", "brand": "NTN", "manufacturer_designation": "NTN N219", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 184, "static_load_kN": 195, "fatigue_load_limit_kN": 21.8, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 4700, "weight_g": 2720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N219 denotes a 95×170×32 mm (3.74 × 6.693 × 1.26 in) cylindrical roller bearing in the N200 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N219 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The N rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×32 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N219 skids at 4,000 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 184/195 kN pair here belongs to N219 as printed, not to the bare size.", "The 184/195 kN ratings, 21.8 kN Pu and 2720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N219?", "a": "N219 is an NTN N single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 195 kN, Pu 21.8 kN, grease limiting speed 4,000 r/min, oil 4,700 r/min, mass about 2720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N219 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N219 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can N219 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 4,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N219-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n219", "＊＊n219", "N219" ], "locale_variants": {} }, { "sku": "N219EA", "brand": "NTN", "manufacturer_designation": "NTN N219EA", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 260, "static_load_kN": 265, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 5200, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N219EA on the 95×170 mm envelope, 32 mm wide: a line-contact radial bearing with the EA high-capacity pressed sheet-steel cage and a grease limiting speed of 3,600 r/min. Digit by digit, N219EA reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N219EA.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The N rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×32 mm envelope matches.", "The N rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×32 mm envelope matches.", "Do not replace N219EA with a deep-groove ball bearing on rating alone: line contact gives 260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 260/265 kN pair here belongs to N219EA as printed, not to the bare size.", "The 260/265 kN ratings, 29.6 kN Pu and 2850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N219EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N219EA?", "a": "N219EA is an NTN N single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 260 kN, C0 265 kN, Pu 29.6 kN, grease limiting speed 3,600 r/min, oil 5,200 r/min, mass about 2850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N219EA is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can N219EA take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N219EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N219EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n219ea", "＊n219ea", "N219EA" ], "locale_variants": {} }, { "sku": "N2219", "brand": "NTN", "manufacturer_designation": "NTN N2219", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 256, "static_load_kN": 298, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3710, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2219 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 256 kN dynamic rating in the 95 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 95 mm, with 170 mm OD and 43 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2219 designation when purchasing. Speed ratio check: limiting 3,600 r/min is .84 of the 4,300 r/min oil value for N2219; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2219 non-locating position preloads the bearing when the shaft grows.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 256/298 kN pair here belongs to N2219 as printed, not to the bare size.", "If the shaft must be located both ways, do not use N2219 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 256/298 kN pair here belongs to N2219 as printed, not to the bare size.", "The 43 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "The 256/298 kN ratings, 33.5 kN Pu and 3710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2219?", "a": "N2219 is an NTN N single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 256 kN, C0 298 kN, Pu 33.5 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3710 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2219 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2219 is supplied in the standard open execution shown in the table." }, { "q": "Can N2219 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2219", "N2219" ], "locale_variants": {} }, { "sku": "N2219E", "brand": "NTN", "manufacturer_designation": "NTN N2219E", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 370, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 3840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2219E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 315 kN dynamic rating in the 95 mm bore. Digit by digit, N2219E reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 37.5 mm radial section ((170−95)/2) frames the roller complement; capacity per millimetre of bore is about 3.3 kN/mm before application factors. The 95 mm (3.74 in) bore and 170 mm (6.693 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 43 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 95 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2219E skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "The 37.5 mm section at 95 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "The 315/370 kN ratings, 41.5 kN Pu and 3840 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2219E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2219E?", "a": "N2219E is an NTN N single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 370 kN, Pu 41.5 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 3840 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2219E is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2219E is supplied in the standard open execution shown in the table." }, { "q": "Can N2219E take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2219E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2219E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2219e", "N2219E" ], "locale_variants": {} }, { "sku": "NF219", "brand": "NTN", "manufacturer_designation": "NTN NF219", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 184, "static_load_kN": 195, "fatigue_load_limit_kN": 21.8, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 4700, "weight_g": 2720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF219 appears as a 95 mm bore single-row cylindrical roller bearing (184 kN C / 195 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NF219 to its envelope: type code NF, series NF200, 95 mm bore; the 170×32 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NF219 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NF219 as a pure radial bearing: keep P below 184 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF219.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The 32 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "Do not replace NF219 with a deep-groove ball bearing on rating alone: line contact gives 184 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NF219 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 184/195 kN ratings, 21.8 kN Pu and 2720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF219?", "a": "NF219 is an NTN NF single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 195 kN, Pu 21.8 kN, grease limiting speed 4,000 r/min, oil 4,700 r/min, mass about 2720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF219 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF219 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NF219 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 4,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf219", "＊＊nf219", "NF219" ], "locale_variants": {} }, { "sku": "NF219EA", "brand": "NTN", "manufacturer_designation": "NTN NF219EA", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 260, "static_load_kN": 265, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 5200, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF219EA belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E, under the ＊ ULTAGE new-generation specification: line-contact rollers between ground raceways for a 260 kN dynamic rating in the 95 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). With C 260 kN and C0 265 kN (C0/C ≈ 1.02) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Rating life at 260 kN C assumes clean oil and adequate film; the 29.6 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 95 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 260/265 kN pair here belongs to NF219EA as printed, not to the bare size.", "The 32 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "Do not replace NF219EA with a deep-groove ball bearing on rating alone: line contact gives 260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF219EA skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The 260/265 kN ratings, 29.6 kN Pu and 2850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF219EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF219EA?", "a": "NF219EA is an NTN NF single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 260 kN, C0 265 kN, Pu 29.6 kN, grease limiting speed 3,600 r/min, oil 5,200 r/min, mass about 2850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF219EA is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NF219EA take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF219EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF219EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf219ea", "＊nf219ea", "NF219EA" ], "locale_variants": {} }, { "sku": "NF2219E", "brand": "NTN", "manufacturer_designation": "NTN NF2219E", "series": "NF2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 370, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 3840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF2219E is the wide (22) section of the NTN NF2200 dimension series for a 95 mm shaft — 315 kN of basic dynamic capacity in a 3840 g, open bearing. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). At 3,800 r/min with oil versus 3,300 r/min with grease (a 500 r/min band), lubrication choice for NF2219E is a thermal decision, not just a sealing one. Mass 3840 g for the 95×170×43 mm NF2219E execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The 37.5 mm section at 95 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 315/370 kN pair here belongs to NF2219E as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "Grease limiting speed 3,300 r/min and oil 3,800 r/min are different limits for NF2219E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 315/370 kN ratings, 41.5 kN Pu and 3840 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF2219E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF2219E?", "a": "NF2219E is an NTN NF single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 370 kN, Pu 41.5 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 3840 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF2219E is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF2219E is supplied in the standard open execution shown in the table." }, { "q": "Can NF2219E take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF2219E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF2219E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf2219e", "NF2219E" ], "locale_variants": {} }, { "sku": "NJ219", "brand": "NTN", "manufacturer_designation": "NTN NJ219", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 184, "static_load_kN": 195, "fatigue_load_limit_kN": 21.8, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 4700, "weight_g": 2720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ219 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 95×170×32 mm ISO 15 envelope. Numbering ties NJ219 to its envelope: type code NJ, series NJ200, 95 mm bore; the 170×32 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Grease limiting speed 4,000 r/min and oil 4,700 r/min are different limits for NJ219: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 32 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "The NJ rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 170×32 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 184/195 kN pair here belongs to NJ219 as printed, not to the bare size.", "The 184/195 kN ratings, 21.8 kN Pu and 2720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ219?", "a": "NJ219 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 195 kN, Pu 21.8 kN, grease limiting speed 4,000 r/min, oil 4,700 r/min, mass about 2720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ219 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ219 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NJ219 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 4,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ219-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj219", "＊＊nj219", "NJ219" ], "locale_variants": {} }, { "sku": "NJ219EA", "brand": "NTN", "manufacturer_designation": "NTN NJ219EA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 260, "static_load_kN": 265, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 5200, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 95 mm shaft NTN supplies NJ219EA: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,600 r/min on grease and 5,200 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ219EA floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NJ219EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 2.7 kN-per-mm-bore figure (260 kN over 95 mm) lets a NJ219EA interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The NJ rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 170×32 mm envelope matches.", "The 32 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "If the shaft must be located both ways, do not use NJ219EA alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NJ219EA with a deep-groove ball bearing on rating alone: line contact gives 260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 260/265 kN ratings, 29.6 kN Pu and 2850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ219EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ219EA?", "a": "NJ219EA is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 260 kN, C0 265 kN, Pu 29.6 kN, grease limiting speed 3,600 r/min, oil 5,200 r/min, mass about 2850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ219EA is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NJ219EA take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ219EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ219EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj219ea", "＊nj219ea", "NJ219EA" ], "locale_variants": {} }, { "sku": "NJ2219", "brand": "NTN", "manufacturer_designation": "NTN NJ2219", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 256, "static_load_kN": 298, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3710, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 95 mm shaft NTN supplies NJ2219: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,600 r/min on grease and 4,300 r/min on oil. Numbering ties NJ2219 to its envelope: type code NJ, series NJ2200, 95 mm bore; the 170×43 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 33.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.16 (298/256 kN) shows the high-static-capacity proportioning of this 95 mm bore. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Open NJ2219 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "The 43 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 256/298 kN pair here belongs to NJ2219 as printed, not to the bare size.", "The 256/298 kN ratings, 33.5 kN Pu and 3710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2219?", "a": "NJ2219 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 256 kN, C0 298 kN, Pu 33.5 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3710 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2219 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2219 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2219 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2219-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2219", "NJ2219" ], "locale_variants": {} }, { "sku": "NJ2219E", "brand": "NTN", "manufacturer_designation": "NTN NJ2219E", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 370, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 3840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2219E appears as a 95 mm bore single-row cylindrical roller bearing (315 kN C / 370 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 3,300 r/min grease and 3,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 95 mm bore. Rating life at 315 kN C assumes clean oil and adequate film; the 41.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NJ2219E; an oversized radius locks the ring on its face and tilts the 43 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 315/370 kN pair here belongs to NJ2219E as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 315/370 kN pair here belongs to NJ2219E as printed, not to the bare size.", "The NJ rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 170×43 mm envelope matches.", "If the shaft must be located both ways, do not use NJ2219E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 315/370 kN ratings, 41.5 kN Pu and 3840 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2219E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2219E?", "a": "NJ2219E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 370 kN, Pu 41.5 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 3840 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2219E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2219E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2219E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2219E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2219E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2219e", "NJ2219E" ], "locale_variants": {} }, { "sku": "NU219-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU219", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 184, "static_load_kN": 195, "fatigue_load_limit_kN": 21.8, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 4700, "weight_g": 2720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU219 is the standard section of the NTN NU200 dimension series for a 95 mm shaft — 184 kN of basic dynamic capacity in a 2720 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). With C 184 kN and C0 195 kN (C0/C ≈ 1.06) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. The 95 mm (3.74 in) bore and 170 mm (6.693 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 32 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU219.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NU219 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NU219 with a deep-groove ball bearing on rating alone: line contact gives 184 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NU rib arrangement is not interchangeable with another prefix on the same 95 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 170×32 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU219 skids at 4,000 r/min and fails by smearing long before L10 fatigue.", "The 184/195 kN ratings, 21.8 kN Pu and 2720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU219?", "a": "NU219 is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 195 kN, Pu 21.8 kN, grease limiting speed 4,000 r/min, oil 4,700 r/min, mass about 2720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU219 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU219 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NU219 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 4,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu219", "＊＊nu219", "NU219", "NU219-NTN" ], "locale_variants": {} }, { "sku": "NU219EA", "brand": "NTN", "manufacturer_designation": "NTN NU219EA", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 260, "static_load_kN": 265, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 5200, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU219EA is the standard section of the NTN NU200 dimension series for a 95 mm shaft — 260 kN of basic dynamic capacity in a 2850 g, open bearing. Numbering ties NU219EA to its envelope: type code NU, series NU200, 95 mm bore; the 170×32 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 5,200 r/min with oil versus 3,600 r/min with grease (a 1,600 r/min band), lubrication choice for NU219EA is a thermal decision, not just a sealing one. Equivalent-load planning treats NU219EA as a pure radial bearing: keep P below 260 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU219EA skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "Do not replace NU219EA with a deep-groove ball bearing on rating alone: line contact gives 260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 3,600 r/min and oil 5,200 r/min are different limits for NU219EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 3,600 r/min and oil 5,200 r/min are different limits for NU219EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 260/265 kN ratings, 29.6 kN Pu and 2850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU219EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU219EA?", "a": "NU219EA is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 260 kN, C0 265 kN, Pu 29.6 kN, grease limiting speed 3,600 r/min, oil 5,200 r/min, mass about 2850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU219EA is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NU219EA take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU219EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU219EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu219ea", "＊nu219ea", "NU219EA" ], "locale_variants": {} }, { "sku": "NU2219", "brand": "NTN", "manufacturer_designation": "NTN NU2219", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 256, "static_load_kN": 298, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3710, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2219 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 95×170×43 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2219 floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2219. Thermal planning around the 3,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,300 r/min for continuously high-duty 95 mm positions. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NU2219 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NU2219 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "The 256/298 kN ratings, 33.5 kN Pu and 3710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2219?", "a": "NU2219 is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 256 kN, C0 298 kN, Pu 33.5 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3710 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2219 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2219 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2219 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2219-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2219", "NU2219" ], "locale_variants": {} }, { "sku": "NU2219E", "brand": "NTN", "manufacturer_designation": "NTN NU2219E", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 370, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 3840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2219E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 95×170×43 mm ISO 15 envelope. Numbering ties NU2219E to its envelope: type code NU, series NU2200, 95 mm bore; the 170×43 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NU2219E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 41.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.17 (370/315 kN) shows the high-static-capacity proportioning of this 95 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Grease limiting speed 3,300 r/min and oil 3,800 r/min are different limits for NU2219E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2219E skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "The 43 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 315/370 kN ratings, 41.5 kN Pu and 3840 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2219E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2219E?", "a": "NU2219E is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 370 kN, Pu 41.5 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 3840 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2219E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2219E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2219E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2219E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2219E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2219e", "NU2219E" ], "locale_variants": {} }, { "sku": "NUP219", "brand": "NTN", "manufacturer_designation": "NTN NUP219", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 184, "static_load_kN": 195, "fatigue_load_limit_kN": 21.8, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 4700, "weight_g": 2720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP219 appears as a 95 mm bore single-row cylindrical roller bearing (184 kN C / 195 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 95 mm, with 170 mm OD and 32 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NUP219 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NUP219 as a pure radial bearing: keep P below 184 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 95 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Do not replace NUP219 with a deep-groove ball bearing on rating alone: line contact gives 184 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Open NUP219 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 184/195 kN pair here belongs to NUP219 as printed, not to the bare size.", "Do not replace NUP219 with a deep-groove ball bearing on rating alone: line contact gives 184 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 184/195 kN ratings, 21.8 kN Pu and 2720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP219?", "a": "NUP219 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 195 kN, Pu 21.8 kN, grease limiting speed 4,000 r/min, oil 4,700 r/min, mass about 2720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP219 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP219 is listed among the ＊ ULTAGE-marked executions in 2203E." }, { "q": "Can NUP219 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,000 r/min grease / 4,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP219-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup219", "＊＊nup219", "NUP219" ], "locale_variants": {} }, { "sku": "NUP219EA", "brand": "NTN", "manufacturer_designation": "NTN NUP219EA", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 260, "static_load_kN": 265, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 5200, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP219EA appears as a 95 mm bore single-row cylindrical roller bearing (260 kN C / 265 kN C0) with the EA high-capacity pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 95 mm, with 170 mm OD and 32 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NUP219EA at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 3,600 r/min grease ceiling should include the cage type (the EA high-capacity pressed sheet-steel cage) and oil-flow option to 5,200 r/min for continuously high-duty 95 mm positions. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The 37.5 mm section at 95 mm bore leaves a narrow oil path; with the EA pressed-steel-cage cage the relubrication groove and oil-level design must keep grease from churning in the 32 mm-wide cavity.", "Grease limiting speed 3,600 r/min and oil 5,200 r/min are different limits for NUP219EA: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NUP rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 170×32 mm envelope matches.", "Do not replace NUP219EA with a deep-groove ball bearing on rating alone: line contact gives 260 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 260/265 kN ratings, 29.6 kN Pu and 2850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP219EA (EA pressed-steel-cage execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP219EA?", "a": "NUP219EA is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 32 mm width (3.74 × 6.693 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 260 kN, C0 265 kN, Pu 29.6 kN, grease limiting speed 3,600 r/min, oil 5,200 r/min, mass about 2850 g. It is open, with the EA high-capacity pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP219EA is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. This page's bearing carries the EA pressed-steel-cage execution." }, { "q": "Can NUP219EA take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP219EA?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 5,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP219EA", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup219ea", "＊nup219ea", "NUP219EA" ], "locale_variants": {} }, { "sku": "NUP2219", "brand": "NTN", "manufacturer_designation": "NTN NUP2219", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 256, "static_load_kN": 298, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3710, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2219 on the 95×170 mm envelope, 43 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,600 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2219 floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. The 37.5 mm radial section ((170−95)/2) frames the roller complement; capacity per millimetre of bore is about 2.7 kN/mm before application factors. Equivalent-load planning treats NUP2219 as a pure radial bearing: keep P below 256 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NUP2219 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "The 37.5 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 43 mm-wide cavity.", "The 256/298 kN ratings, 33.5 kN Pu and 3710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2219 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2219?", "a": "NUP2219 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 256 kN, C0 298 kN, Pu 33.5 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3710 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2219 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2219 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2219 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2219?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113.5 mm, Ew 151.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2219-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2219", "NUP2219" ], "locale_variants": {} }, { "sku": "NUP2219E", "brand": "NTN", "manufacturer_designation": "NTN NUP2219E", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 370, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 3840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2219E denotes a 95×170×43 mm (3.74 × 6.693 × 1.693 in) cylindrical roller bearing in the NUP2200 family, the high-capacity pressed-steel cage of the E execution. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 95 mm, with 170 mm OD and 43 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,300 r/min grease and 3,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 95 mm bore. The 3.3 kN-per-mm-bore figure (315 kN over 95 mm) lets a NUP2219E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP2219E; an oversized radius locks the ring on its face and tilts the 43 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NUP2219E with a deep-groove ball bearing on rating alone: line contact gives 315 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 315/370 kN pair here belongs to NUP2219E as printed, not to the bare size.", "If the shaft must be located both ways, do not use NUP2219E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 315/370 kN ratings, 41.5 kN Pu and 3840 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2219E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2219E?", "a": "NUP2219E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 370 kN, Pu 41.5 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 3840 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2219E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2219E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2219E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2219E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 112.5 mm, Ew 154.5 mm. The nominal bore/OD remain 95/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2219E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2219e", "NUP2219E" ], "locale_variants": {} }, { "sku": "N2319", "brand": "NTN", "manufacturer_designation": "NTN N2319", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 410, "static_load_kN": 460, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2319 appears as a 95 mm bore single-row cylindrical roller bearing (410 kN C / 460 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate N states which ring carries the ribs, which determines whether N2319 floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. At 3,500 r/min with oil versus 3,000 r/min with grease (a 500 r/min band), lubrication choice for N2319 is a thermal decision, not just a sealing one. The 95 mm (3.74 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 67 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2319 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 410/460 kN pair here belongs to N2319 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for N2319: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 410/460 kN ratings, 50 kN Pu and 9020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2319?", "a": "N2319 is an NTN N single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 460 kN, Pu 50 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9020 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2319 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2319 is supplied in the standard open execution shown in the table." }, { "q": "Can N2319 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2319", "N2319" ], "locale_variants": {} }, { "sku": "N319", "brand": "NTN", "manufacturer_designation": "NTN N319", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 287, "static_load_kN": 289, "fatigue_load_limit_kN": 31.5, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N319 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 95×200×45 mm ISO 15 envelope. Digit by digit, N319 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives N319 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 3,400 r/min is .85 of the 4,000 r/min oil value for N319; grease-churn heating closes that gap as fill quantity rises. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for N319: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace N319 with a deep-groove ball bearing on rating alone: line contact gives 287 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use N319 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 287/289 kN ratings, 31.5 kN Pu and 5990 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N319?", "a": "N319 is an NTN N single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 287 kN, C0 289 kN, Pu 31.5 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5990 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N319 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N319 is supplied in the standard open execution shown in the table." }, { "q": "Can N319 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N319-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n319", "N319" ], "locale_variants": {} }, { "sku": "NF319", "brand": "NTN", "manufacturer_designation": "NTN NF319", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 287, "static_load_kN": 289, "fatigue_load_limit_kN": 31.5, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF319 is the standard section of the NTN NF300 dimension series for a 95 mm shaft — 287 kN of basic dynamic capacity in a 5990 g, open bearing. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 95 mm, with 200 mm OD and 45 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NF319 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 95 mm (3.74 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 45 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 95 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The NF rib arrangement is not interchangeable with another prefix on the same 95 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 200×45 mm envelope matches.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for NF319: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NF rib arrangement is not interchangeable with another prefix on the same 95 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 200×45 mm envelope matches.", "Do not replace NF319 with a deep-groove ball bearing on rating alone: line contact gives 287 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 287/289 kN ratings, 31.5 kN Pu and 5990 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF319?", "a": "NF319 is an NTN NF single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 287 kN, C0 289 kN, Pu 31.5 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5990 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF319 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF319 is supplied in the standard open execution shown in the table." }, { "q": "Can NF319 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf319", "NF319" ], "locale_variants": {} }, { "sku": "NJ2319", "brand": "NTN", "manufacturer_designation": "NTN NJ2319", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 410, "static_load_kN": 460, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2319 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 410 kN dynamic rating in the 95 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2319 floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ2319 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Housing and shaft fillets must clear the ring chamfers of NJ2319; an oversized radius locks the ring on its face and tilts the 67 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2319 skids at 3,000 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 410/460 kN ratings, 50 kN Pu and 9020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2319?", "a": "NJ2319 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 460 kN, Pu 50 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9020 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2319 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2319 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2319 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2319-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2319", "NJ2319" ], "locale_variants": {} }, { "sku": "NJ2319E", "brand": "NTN", "manufacturer_designation": "NTN NJ2319E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 510, "static_load_kN": 585, "fatigue_load_limit_kN": 63, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2319E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 510 kN dynamic rating in the 95 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2319E floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NJ2319E designation when purchasing. Mass Dimensions 95×200×67 mm and the 510 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ2319E execution. Housing and shaft fillets must clear the ring chamfers of NJ2319E; an oversized radius locks the ring on its face and tilts the 67 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The 67 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2319E skids at 2,700 r/min and fails by smearing long before L10 fatigue.", "The 67 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "The 510/585 kN ratings, 63 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2319E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2319E?", "a": "NJ2319E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 585 kN, Pu 63 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2319E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2319E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2319E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2319E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2319E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2319e", "NJ2319E" ], "locale_variants": {} }, { "sku": "NJ319", "brand": "NTN", "manufacturer_designation": "NTN NJ319", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 287, "static_load_kN": 289, "fatigue_load_limit_kN": 31.5, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ319 on the 95×200 mm envelope, 45 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ319 floats or locates; the numeric remainder is the ISO 15 series and 95 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NJ319 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 287 kN C assumes clean oil and adequate film; the 31.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Open NJ319 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "The 52.5 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "Do not replace NJ319 with a deep-groove ball bearing on rating alone: line contact gives 287 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NJ319 with a deep-groove ball bearing on rating alone: line contact gives 287 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 287/289 kN ratings, 31.5 kN Pu and 5990 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ319?", "a": "NJ319 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 287 kN, C0 289 kN, Pu 31.5 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5990 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ319 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ319 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ319 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ319-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj319", "NJ319" ], "locale_variants": {} }, { "sku": "NJ319E", "brand": "NTN", "manufacturer_designation": "NTN NJ319E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 385, "fatigue_load_limit_kN": 42, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ319E appears as a 95 mm bore single-row cylindrical roller bearing (370 kN C / 385 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 95 mm, with 200 mm OD and 45 mm width from the ISO 15 general plan. The 45 mm width and 52.5 mm section put the NJ300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 42 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.04 (385/370 kN) shows the high-static-capacity proportioning of this 95 mm bore. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 95 mm shaft.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "The 52.5 mm section at 95 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NJ319E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "The 370/385 kN ratings, 42 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ319E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ319E?", "a": "NJ319E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 385 kN, Pu 42 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ319E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ319E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ319E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ319E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ319E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj319e", "NJ319E" ], "locale_variants": {} }, { "sku": "NU2319", "brand": "NTN", "manufacturer_designation": "NTN NU2319", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 410, "static_load_kN": 460, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2319 on the 95×200 mm envelope, 67 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Digit by digit, NU2319 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2319 skids at 3,000 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 410/460 kN pair here belongs to NU2319 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2319 skids at 3,000 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 410/460 kN pair here belongs to NU2319 as printed, not to the bare size.", "The 410/460 kN ratings, 50 kN Pu and 9020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2319?", "a": "NU2319 is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 460 kN, Pu 50 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9020 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2319 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2319 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2319 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2319-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2319", "NU2319" ], "locale_variants": {} }, { "sku": "NU2319E", "brand": "NTN", "manufacturer_designation": "NTN NU2319E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 510, "static_load_kN": 585, "fatigue_load_limit_kN": 63, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2319E denotes a 95×200×67 mm (3.74 × 7.874 × 2.638 in) cylindrical roller bearing in the NU2300 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NU2319E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 52.5 mm radial section ((200−95)/2) frames the roller complement; capacity per millimetre of bore is about 5.4 kN/mm before application factors. The 5.4 kN-per-mm-bore figure (510 kN over 95 mm) lets a NU2319E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU2319E; an oversized radius locks the ring on its face and tilts the 67 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 67 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "Do not replace NU2319E with a deep-groove ball bearing on rating alone: line contact gives 510 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NU2319E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "The 52.5 mm section at 95 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 67 mm-wide cavity.", "The 510/585 kN ratings, 63 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2319E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2319E?", "a": "NU2319E is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 585 kN, Pu 63 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2319E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2319E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2319E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2319E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2319E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2319e", "NU2319E" ], "locale_variants": {} }, { "sku": "NU319-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU319", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 287, "static_load_kN": 289, "fatigue_load_limit_kN": 31.5, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU319 on the 95×200 mm envelope, 45 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. Numbering ties NU319 to its envelope: type code NU, series NU300, 95 mm bore; the 200×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU319 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 3,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,000 r/min for continuously high-duty 95 mm positions. Housing and shaft fillets must clear the ring chamfers of NU319; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Open NU319 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "The 52.5 mm section at 95 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "Do not replace NU319 with a deep-groove ball bearing on rating alone: line contact gives 287 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NU319 with a deep-groove ball bearing on rating alone: line contact gives 287 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 287/289 kN ratings, 31.5 kN Pu and 5990 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU319?", "a": "NU319 is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 287 kN, C0 289 kN, Pu 31.5 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5990 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU319 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU319 is supplied in the standard open execution shown in the table." }, { "q": "Can NU319 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu319", "NU319", "NU319-NTN" ], "locale_variants": {} }, { "sku": "NU319E", "brand": "NTN", "manufacturer_designation": "NTN NU319E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 385, "fatigue_load_limit_kN": 42, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 95 mm shaft NTN supplies NU319E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,100 r/min on grease and 3,600 r/min on oil. Digit by digit, NU319E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 52.5 mm radial section ((200−95)/2) frames the roller complement; capacity per millimetre of bore is about 3.9 kN/mm before application factors. The 3.9 kN-per-mm-bore figure (370 kN over 95 mm) lets a NU319E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU319E.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Grease limiting speed 3,100 r/min and oil 3,600 r/min are different limits for NU319E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 3,100 r/min and oil 3,600 r/min are different limits for NU319E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 95 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 52.5 mm section at 95 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "The 370/385 kN ratings, 42 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU319E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU319E?", "a": "NU319E is an NTN NU single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 385 kN, Pu 42 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU319E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU319E is supplied in the standard open execution shown in the table." }, { "q": "Can NU319E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU319E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU319E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu319e", "NU319E" ], "locale_variants": {} }, { "sku": "NUP2319", "brand": "NTN", "manufacturer_designation": "NTN NUP2319", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 410, "static_load_kN": 460, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 95 mm shaft NTN supplies NUP2319: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,000 r/min on grease and 3,500 r/min on oil. Digit by digit, NUP2319 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 95 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,000 r/min grease and 3,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 95 mm bore. Selection arithmetic: Pu 50 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.12 (460/410 kN) shows the high-static-capacity proportioning of this 95 mm bore. Heat the inner ring to max 120 °C for the 95 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2319 skids at 3,000 r/min and fails by smearing long before L10 fatigue.", "The NUP rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 200×67 mm envelope matches.", "Open NUP2319 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "If the shaft must be located both ways, do not use NUP2319 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 410/460 kN ratings, 50 kN Pu and 9020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2319?", "a": "NUP2319 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 460 kN, Pu 50 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9020 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2319 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2319 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2319 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2319-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2319", "NUP2319" ], "locale_variants": {} }, { "sku": "NUP2319E", "brand": "NTN", "manufacturer_designation": "NTN NUP2319E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 510, "static_load_kN": 585, "fatigue_load_limit_kN": 63, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2319E is the extra-wide (23) section of the NTN NUP2300 dimension series for a 95 mm shaft — 510 kN of basic dynamic capacity in a open bearing. Numbering ties NUP2319E to its envelope: type code NUP, series NUP2300, 95 mm bore; the 200×67 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NUP2319E designation when purchasing. Equivalent-load planning treats NUP2319E as a pure radial bearing: keep P below 510 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP2319E; an oversized radius locks the ring on its face and tilts the 67 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2319E skids at 2,700 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for NUP2319E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 52.5 mm section at 95 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 67 mm-wide cavity.", "The 67 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 95 mm inner ring.", "The 510/585 kN ratings, 63 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2319E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2319E?", "a": "NUP2319E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 585 kN, Pu 63 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2319E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2319E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2319E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2319E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2319E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2319e", "NUP2319E" ], "locale_variants": {} }, { "sku": "NUP319", "brand": "NTN", "manufacturer_designation": "NTN NUP319", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 287, "static_load_kN": 289, "fatigue_load_limit_kN": 31.5, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP319 denotes a 95×200×45 mm (3.74 × 7.874 × 1.772 in) cylindrical roller bearing in the NUP300 family, a pressed sheet-steel cage. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). The 45 mm width and 52.5 mm section put the NUP300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 31.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.01 (289/287 kN) shows the high-static-capacity proportioning of this 95 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP319; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 200×45 mm envelope matches.", "Do not replace NUP319 with a deep-groove ball bearing on rating alone: line contact gives 287 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "Open NUP319 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 95 mm contact.", "The 287/289 kN ratings, 31.5 kN Pu and 5990 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP319 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP319?", "a": "NUP319 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 287 kN, C0 289 kN, Pu 31.5 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 5990 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP319 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP319 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP319 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP319?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm, Ew 173.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP319-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup319", "NUP319" ], "locale_variants": {} }, { "sku": "NUP319E", "brand": "NTN", "manufacturer_designation": "NTN NUP319E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 385, "fatigue_load_limit_kN": 42, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 95 mm shaft NTN supplies NUP319E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,100 r/min on grease and 3,600 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 95 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 95 mm (3.74 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 45 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP319E; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 95 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 95 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 200×45 mm envelope matches.", "The 52.5 mm section at 95 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/385 kN pair here belongs to NUP319E as printed, not to the bare size.", "The 370/385 kN ratings, 42 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP319E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP319E?", "a": "NUP319E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 385 kN, Pu 42 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP319E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP319E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP319E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP319E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 121.5 mm. The nominal bore/OD remain 95/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP319E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=150", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup319e", "NUP319E" ], "locale_variants": {} }, { "sku": "NN4920", "brand": "NTN", "manufacturer_designation": "NTN NN4920", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 145, "static_load_kN": 260, "fatigue_load_limit_kN": 30, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5100, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN4920 is the extra-light (10/49) section of the NTN NN4900 dimension series for a 100 mm shaft — 145 kN of basic dynamic capacity in a 1750 g, open bearing. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 100 mm (00–03 use the 10/12/15/17 exception table). At 5,100 r/min with oil versus 4,300 r/min with grease (a 800 r/min band), lubrication choice for NN4920 is a thermal decision, not just a sealing one. Speed ratio check: limiting 4,300 r/min is .84 of the 5,100 r/min oil value for NN4920; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 100 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The 20.0 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 140 mm race brinells and releases as vibration within hours.", "Do not replace NN4920 with a deep-groove ball bearing on rating alone: line contact gives 145 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 4,300 r/min and oil 5,100 r/min are different limits for NN4920: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 145/260 kN ratings, 30 kN Pu and 1750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4920 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4920?", "a": "NN4920 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 100 mm bore, 140 mm OD and 40 mm width (3.937 × 5.512 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 145 kN, C0 260 kN, Pu 30 kN, grease limiting speed 4,300 r/min, oil 5,100 r/min, mass about 1750 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4920 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4920 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4920?", "a": "NN4920 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN4920?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113 mm. The nominal bore/OD remain 100/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4920", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4920", "NN4920" ], "locale_variants": {} }, { "sku": "NN4920K", "brand": "NTN", "manufacturer_designation": "NTN NN4920K", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 145, "static_load_kN": 260, "fatigue_load_limit_kN": 30, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5100, "weight_g": 1670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4920K appears as a 100 mm bore single-row cylindrical roller bearing (145 kN C / 260 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 100 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NN4920K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 30 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.79 (260/145 kN) shows the high-static-capacity proportioning of this 100 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 100 mm shaft.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The NN rib arrangement is not interchangeable with another prefix on the same 100 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 140×40 mm envelope matches.", "Grease limiting speed 4,300 r/min and oil 5,100 r/min are different limits for NN4920K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NN4920K with a deep-groove ball bearing on rating alone: line contact gives 145 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.", "The 145/260 kN ratings, 30 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4920K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4920K?", "a": "NN4920K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 100 mm bore, 140 mm OD and 40 mm width (3.937 × 5.512 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 145 kN, C0 260 kN, Pu 30 kN, grease limiting speed 4,300 r/min, oil 5,100 r/min, mass about 1670 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4920K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4920K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4920K?", "a": "The K suffix denotes a 1:12 tapered bore. NN4920K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4920 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN4920K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113 mm. The nominal bore/OD remain 100/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4920K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4920k", "NN4920K" ], "locale_variants": {} }, { "sku": "NNU4920K", "brand": "NTN", "manufacturer_designation": "NTN NNU4920K", "series": "NNU4900-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 145, "static_load_kN": 260, "fatigue_load_limit_kN": 30, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5100, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NNU4920K on the 100×140 mm envelope, 40 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 4,300 r/min. Numbering ties NNU4920K to its envelope: type code NNU, series NNU4900, 100 mm bore; the 140×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 113 mm — the envelope inside the 100/140 mm bore/OD where the rollers actually run. Mass 1750 g for the 100×140×40 mm NNU4920K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 100 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 140 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 145/260 kN pair here belongs to NNU4920K as printed, not to the bare size.", "The 20.0 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 20.0 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The NNU rib arrangement is not interchangeable with another prefix on the same 100 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 140×40 mm envelope matches.", "The 145/260 kN ratings, 30 kN Pu and 1750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4920K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNU4920K?", "a": "NNU4920K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 100 mm bore, 140 mm OD and 40 mm width (3.937 × 5.512 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 145 kN, C0 260 kN, Pu 30 kN, grease limiting speed 4,300 r/min, oil 5,100 r/min, mass about 1750 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4920K is the NNU execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4920K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4920K?", "a": "The K suffix denotes a 1:12 tapered bore. NNU4920K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4920 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NNU4920K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113 mm. The nominal bore/OD remain 100/140 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NNU4920K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nnu4920k", "NNU4920K" ], "locale_variants": {} }, { "sku": "N1020", "brand": "NTN", "manufacturer_designation": "NTN N1020", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 103, "static_load_kN": 126, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 5400, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N1020 denotes a 100×150×24 mm (3.937 × 5.906 × 0.945 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N1020 floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. At 5,400 r/min with oil versus 4,600 r/min with grease (a 800 r/min band), lubrication choice for N1020 is a thermal decision, not just a sealing one. Equivalent-load planning treats N1020 as a pure radial bearing: keep P below 103 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Open N1020 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1020 skids at 4,600 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 103/126 kN pair here belongs to N1020 as printed, not to the bare size.", "Grease limiting speed 4,600 r/min and oil 5,400 r/min are different limits for N1020: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 103/126 kN ratings, 14.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1020 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1020?", "a": "N1020 is an NTN N single-row cylindrical roller bearing to ISO 15: 100 mm bore, 150 mm OD and 24 mm width (3.937 × 5.906 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 103 kN, C0 126 kN, Pu 14.4 kN, grease limiting speed 4,600 r/min, oil 5,400 r/min, mass about 1430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1020 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1020 is supplied in the standard open execution shown in the table." }, { "q": "Can N1020 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1020?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113 mm, Ew 137 mm. The nominal bore/OD remain 100/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 5,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1020", "N1020" ], "locale_variants": {} }, { "sku": "NJ1020", "brand": "NTN", "manufacturer_designation": "NTN NJ1020", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 103, "static_load_kN": 126, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 5400, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1020 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 100 mm shaft — 103 kN of basic dynamic capacity in a 1430 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 100 mm, with 150 mm OD and 24 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NJ1020 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 14.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.22 (126/103 kN) shows the high-static-capacity proportioning of this 100 mm bore. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The 24 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 103/126 kN pair here belongs to NJ1020 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 103/126 kN ratings, 14.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1020 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1020?", "a": "NJ1020 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 150 mm OD and 24 mm width (3.937 × 5.906 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 103 kN, C0 126 kN, Pu 14.4 kN, grease limiting speed 4,600 r/min, oil 5,400 r/min, mass about 1430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1020 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1020 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1020 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1020?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113 mm, Ew 137 mm. The nominal bore/OD remain 100/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 5,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1020", "NJ1020" ], "locale_variants": {} }, { "sku": "NN3020", "brand": "NTN", "manufacturer_designation": "NTN NN3020", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 170, "static_load_kN": 256, "fatigue_load_limit_kN": 29.2, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 4800, "weight_g": 2260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3020 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 170 kN dynamic rating in the 100 mm bore. Digit by digit, NN3020 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,800 r/min with oil versus 4,000 r/min with grease (a 800 r/min band), lubrication choice for NN3020 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 100 mm shaft.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The NN rib arrangement is not interchangeable with another prefix on the same 100 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 150×37 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Do not replace NN3020 with a deep-groove ball bearing on rating alone: line contact gives 170 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 4,000 r/min and oil 4,800 r/min are different limits for NN3020: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 170/256 kN ratings, 29.2 kN Pu and 2260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3020 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3020?", "a": "NN3020 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 100 mm bore, 150 mm OD and 37 mm width (3.937 × 5.906 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 170 kN, C0 256 kN, Pu 29.2 kN, grease limiting speed 4,000 r/min, oil 4,800 r/min, mass about 2260 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3020 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3020 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3020?", "a": "NN3020 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3020?", "a": "NTN rates NN3020 at 4,000 r/min with grease and 4,800 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3020", "NN3020" ], "locale_variants": {} }, { "sku": "NN3020K", "brand": "NTN", "manufacturer_designation": "NTN NN3020K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 170, "static_load_kN": 256, "fatigue_load_limit_kN": 29.2, "limiting_speed_rpm": 4000, "max_rpm": 4000, "speed_oil_rpm": 4800, "weight_g": 2190, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 100 mm shaft NTN supplies NN3020K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,000 r/min on grease and 4,800 r/min on oil. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3020K floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 29.2 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.51 (256/170 kN) shows the high-static-capacity proportioning of this 100 mm bore. Heat the inner ring to max 120 °C for the 100 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 170/256 kN pair here belongs to NN3020K as printed, not to the bare size.", "The 25.0 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 37 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 170/256 kN pair here belongs to NN3020K as printed, not to the bare size.", "The 170/256 kN ratings, 29.2 kN Pu and 2190 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3020K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3020K?", "a": "NN3020K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 100 mm bore, 150 mm OD and 37 mm width (3.937 × 5.906 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 170 kN, C0 256 kN, Pu 29.2 kN, grease limiting speed 4,000 r/min, oil 4,800 r/min, mass about 2190 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3020K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3020K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3020K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3020K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3020 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3020K?", "a": "NTN rates NN3020K at 4,000 r/min with grease and 4,800 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3020K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3020k", "NN3020K" ], "locale_variants": {} }, { "sku": "NU1020", "brand": "NTN", "manufacturer_designation": "NTN NU1020", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 103, "static_load_kN": 126, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 5400, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1020 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 103 kN dynamic rating in the 100 mm bore. Digit by digit, NU1020 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. The 1.0 kN-per-mm-bore figure (103 kN over 100 mm) lets a NU1020 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 100 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Grease limiting speed 4,600 r/min and oil 5,400 r/min are different limits for NU1020: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1020 skids at 4,600 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 103/126 kN pair here belongs to NU1020 as printed, not to the bare size.", "The 103/126 kN ratings, 14.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1020 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1020?", "a": "NU1020 is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 150 mm OD and 24 mm width (3.937 × 5.906 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 103 kN, C0 126 kN, Pu 14.4 kN, grease limiting speed 4,600 r/min, oil 5,400 r/min, mass about 1430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1020 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1020 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1020 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1020?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113 mm, Ew 137 mm. The nominal bore/OD remain 100/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 5,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1020-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1020", "NU1020" ], "locale_variants": {} }, { "sku": "NUP1020", "brand": "NTN", "manufacturer_designation": "NTN NUP1020", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 103, "static_load_kN": 126, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 4600, "max_rpm": 4600, "speed_oil_rpm": 5400, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1020 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 103 kN dynamic rating in the 100 mm bore. Digit by digit, NUP1020 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 5,400 r/min with oil versus 4,600 r/min with grease (a 800 r/min band), lubrication choice for NUP1020 is a thermal decision, not just a sealing one. Thermal planning around the 4,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 5,400 r/min for continuously high-duty 100 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP1020 non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Grease limiting speed 4,600 r/min and oil 5,400 r/min are different limits for NUP1020: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 103/126 kN pair here belongs to NUP1020 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Grease limiting speed 4,600 r/min and oil 5,400 r/min are different limits for NUP1020: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 103/126 kN ratings, 14.4 kN Pu and 1430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1020 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1020?", "a": "NUP1020 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 150 mm OD and 24 mm width (3.937 × 5.906 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 103 kN, C0 126 kN, Pu 14.4 kN, grease limiting speed 4,600 r/min, oil 5,400 r/min, mass about 1430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1020 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1020 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1020 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1020?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 113 mm, Ew 137 mm. The nominal bore/OD remain 100/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,600 r/min grease / 5,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1020", "NUP1020" ], "locale_variants": {} }, { "sku": "N220", "brand": "NTN", "manufacturer_designation": "NTN N220", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 217, "fatigue_load_limit_kN": 23.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 3260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N220 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 203 kN dynamic rating in the 100 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N220 floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. With C 203 kN and C0 217 kN (C0/C ≈ 1.07) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Speed ratio check: limiting 3,800 r/min is .84 of the 4,500 r/min oil value for N220; grease-churn heating closes that gap as fill quantity rises. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Do not replace N220 with a deep-groove ball bearing on rating alone: line contact gives 203 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N220 skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N220 skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N220 skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "The 203/217 kN ratings, 23.9 kN Pu and 3260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N220?", "a": "N220 is an NTN N single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 217 kN, Pu 23.9 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 3260 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N220 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N220 is supplied in the standard open execution shown in the table." }, { "q": "Can N220 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N220-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n220", "N220" ], "locale_variants": {} }, { "sku": "N2220", "brand": "NTN", "manufacturer_designation": "NTN N2220", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 340, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_g": 4480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2220 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 100×180×46 mm ISO 15 envelope. Numbering ties N2220 to its envelope: type code N, series N2200, 100 mm bore; the 180×46 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2220 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats N2220 as a pure radial bearing: keep P below 286 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use N2220 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "Do not replace N2220 with a deep-groove ball bearing on rating alone: line contact gives 286 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 286/340 kN ratings, 37.5 kN Pu and 4480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2220?", "a": "N2220 is an NTN N single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 340 kN, Pu 37.5 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min, mass about 4480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2220 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2220 is supplied in the standard open execution shown in the table." }, { "q": "Can N2220 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2220", "N2220" ], "locale_variants": {} }, { "sku": "NF220", "brand": "NTN", "manufacturer_designation": "NTN NF220", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 217, "fatigue_load_limit_kN": 23.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 3260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NF220 on the 100×180 mm envelope, 34 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,800 r/min. Digit by digit, NF220 reads as NF (one rib on each ring), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 100 mm (3.937 in) bore and 180 mm (7.087 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 34 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NF220 with a deep-groove ball bearing on rating alone: line contact gives 203 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 40.0 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 34 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 203/217 kN pair here belongs to NF220 as printed, not to the bare size.", "The 203/217 kN ratings, 23.9 kN Pu and 3260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF220?", "a": "NF220 is an NTN NF single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 217 kN, Pu 23.9 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 3260 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF220 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF220 is supplied in the standard open execution shown in the table." }, { "q": "Can NF220 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf220", "NF220" ], "locale_variants": {} }, { "sku": "NJ220", "brand": "NTN", "manufacturer_designation": "NTN NJ220", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 217, "fatigue_load_limit_kN": 23.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 3260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ220 appears as a 100 mm bore single-row cylindrical roller bearing (203 kN C / 217 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ220 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 203 kN and C0 217 kN (C0/C ≈ 1.07) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Speed ratio check: limiting 3,800 r/min is .84 of the 4,500 r/min oil value for NJ220; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ220; an oversized radius locks the ring on its face and tilts the 34 mm-wide seat.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The 34 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "The 34 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "Do not replace NJ220 with a deep-groove ball bearing on rating alone: line contact gives 203 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ220 skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "The 203/217 kN ratings, 23.9 kN Pu and 3260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ220?", "a": "NJ220 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 217 kN, Pu 23.9 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 3260 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ220 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ220 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ220 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ220-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj220", "NJ220" ], "locale_variants": {} }, { "sku": "NJ220E", "brand": "NTN", "manufacturer_designation": "NTN NJ220E", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 277, "static_load_kN": 305, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ220E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 277 kN dynamic rating in the 100 mm bore. Numbering ties NJ220E to its envelope: type code NJ, series NJ200, 100 mm bore; the 180×34 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NJ220E designation when purchasing. The 2.8 kN-per-mm-bore figure (277 kN over 100 mm) lets a NJ220E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "If the shaft must be located both ways, do not use NJ220E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 34 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ220E skids at 3,500 r/min and fails by smearing long before L10 fatigue.", "The 34 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "The 277/305 kN ratings, 33.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ220E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ220E?", "a": "NJ220E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 277 kN, C0 305 kN, Pu 33.5 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ220E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ220E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ220E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ220E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ220E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj220e", "NJ220E" ], "locale_variants": {} }, { "sku": "NJ2220", "brand": "NTN", "manufacturer_designation": "NTN NJ2220", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 340, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_g": 4480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2220 denotes a 100×180×46 mm (3.937 × 7.087 × 1.811 in) cylindrical roller bearing in the NJ2200 family, a pressed sheet-steel cage. Digit by digit, NJ2220 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 286 kN and C0 340 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Mass 4480 g for the 100×180×46 mm NJ2220 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NJ2220; an oversized radius locks the ring on its face and tilts the 46 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Grease limiting speed 3,500 r/min and oil 4,100 r/min are different limits for NJ2220: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2220 skids at 3,500 r/min and fails by smearing long before L10 fatigue.", "The 286/340 kN ratings, 37.5 kN Pu and 4480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2220?", "a": "NJ2220 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 340 kN, Pu 37.5 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min, mass about 4480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2220 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2220 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2220 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2220-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2220", "NJ2220" ], "locale_variants": {} }, { "sku": "NJ2220E", "brand": "NTN", "manufacturer_designation": "NTN NJ2220E", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 445, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 100 mm shaft NTN supplies NJ2220E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,100 r/min on grease and 3,600 r/min on oil. Numbering ties NJ2220E to its envelope: type code NJ, series NJ2200, 100 mm bore; the 180×46 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2220E. Selection arithmetic: Pu 49 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.20 (445/370 kN) shows the high-static-capacity proportioning of this 100 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Do not replace NJ2220E with a deep-groove ball bearing on rating alone: line contact gives 370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/445 kN pair here belongs to NJ2220E as printed, not to the bare size.", "The 40.0 mm section at 100 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 370/445 kN ratings, 49 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2220E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2220E?", "a": "NJ2220E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 445 kN, Pu 49 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2220E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2220E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2220E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2220E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2220E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2220e", "NJ2220E" ], "locale_variants": {} }, { "sku": "NU220-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU220", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 217, "fatigue_load_limit_kN": 23.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 3260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU220 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 100×180×34 mm ISO 15 envelope. Numbering ties NU220 to its envelope: type code NU, series NU200, 100 mm bore; the 180×34 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 34 mm width and 40.0 mm section put the NU200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 100 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Open NU220 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "If the shaft must be located both ways, do not use NU220 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NU220 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU220 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "The 203/217 kN ratings, 23.9 kN Pu and 3260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU220?", "a": "NU220 is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 217 kN, Pu 23.9 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 3260 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU220 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU220 is supplied in the standard open execution shown in the table." }, { "q": "Can NU220 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu220", "NU220", "NU220-NTN" ], "locale_variants": {} }, { "sku": "NU220E", "brand": "NTN", "manufacturer_designation": "NTN NU220E", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 277, "static_load_kN": 305, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU220E on the 100×180 mm envelope, 34 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 3,500 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU220E floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU220E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass Dimensions 100×180×34 mm and the 277 kN C rating define the substitution envelope; check the 2203E mass column for this exact NU220E execution. Housing and shaft fillets must clear the ring chamfers of NU220E; an oversized radius locks the ring on its face and tilts the 34 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "Do not replace NU220E with a deep-groove ball bearing on rating alone: line contact gives 277 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NU220E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 277/305 kN ratings, 33.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU220E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU220E?", "a": "NU220E is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 277 kN, C0 305 kN, Pu 33.5 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU220E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU220E is supplied in the standard open execution shown in the table." }, { "q": "Can NU220E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU220E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU220E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu220e", "NU220E" ], "locale_variants": {} }, { "sku": "NU2220", "brand": "NTN", "manufacturer_designation": "NTN NU2220", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 340, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_g": 4480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2220 appears as a 100 mm bore single-row cylindrical roller bearing (286 kN C / 340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 100 mm, with 180 mm OD and 46 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,500 r/min grease and 4,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 100 mm bore. Selection arithmetic: Pu 37.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.19 (340/286 kN) shows the high-static-capacity proportioning of this 100 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2220.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The 40.0 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.", "If the shaft must be located both ways, do not use NU2220 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2220 skids at 3,500 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NU2220 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 286/340 kN ratings, 37.5 kN Pu and 4480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2220?", "a": "NU2220 is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 340 kN, Pu 37.5 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min, mass about 4480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2220 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2220 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2220 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2220-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2220", "NU2220" ], "locale_variants": {} }, { "sku": "NU2220E", "brand": "NTN", "manufacturer_designation": "NTN NU2220E", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 445, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2220E is the wide (22) section of the NTN NU2200 dimension series for a 100 mm shaft — 370 kN of basic dynamic capacity in a open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 100 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NU2220E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a k5/m5 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "If the shaft must be located both ways, do not use NU2220E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2220E skids at 3,100 r/min and fails by smearing long before L10 fatigue.", "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 370/445 kN ratings, 49 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2220E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2220E?", "a": "NU2220E is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 445 kN, Pu 49 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2220E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2220E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2220E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2220E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2220E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2220e", "NU2220E" ], "locale_variants": {} }, { "sku": "NUP220", "brand": "NTN", "manufacturer_designation": "NTN NUP220", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 217, "fatigue_load_limit_kN": 23.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 3260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 100 mm shaft NTN supplies NUP220: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,800 r/min on grease and 4,500 r/min on oil. Numbering ties NUP220 to its envelope: type code NUP, series NUP200, 100 mm bore; the 180×34 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 120 mm and Ew 160 mm — the envelope inside the 100/180 mm bore/OD where the rollers actually run. The 100 mm (3.937 in) bore and 180 mm (7.087 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 34 mm-wide ring. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 100 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 203/217 kN pair here belongs to NUP220 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP220 skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The NUP rib arrangement is not interchangeable with another prefix on the same 100 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 180×34 mm envelope matches.", "The 203/217 kN ratings, 23.9 kN Pu and 3260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP220?", "a": "NUP220 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 217 kN, Pu 23.9 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 3260 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP220 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP220 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP220 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP220-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup220", "NUP220" ], "locale_variants": {} }, { "sku": "NUP220E", "brand": "NTN", "manufacturer_designation": "NTN NUP220E", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 277, "static_load_kN": 305, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 100 mm shaft NTN supplies NUP220E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 3,500 r/min on grease and 4,100 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP220E floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP220E. Rating life at 277 kN C assumes clean oil and adequate film; the 33.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NUP220E; an oversized radius locks the ring on its face and tilts the 34 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 40.0 mm section at 100 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 34 mm-wide cavity.", "Grease limiting speed 3,500 r/min and oil 4,100 r/min are different limits for NUP220E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 277/305 kN ratings, 33.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP220E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP220E?", "a": "NUP220E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 34 mm width (3.937 × 7.087 × 1.339 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 277 kN, C0 305 kN, Pu 33.5 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP220E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP220E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP220E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP220E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP220E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup220e", "NUP220E" ], "locale_variants": {} }, { "sku": "NUP2220", "brand": "NTN", "manufacturer_designation": "NTN NUP2220", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 286, "static_load_kN": 340, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3500, "max_rpm": 3500, "speed_oil_rpm": 4100, "weight_g": 4480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2220 is the wide (22) section of the NTN NUP2200 dimension series for a 100 mm shaft — 286 kN of basic dynamic capacity in a 4480 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 100 mm, with 180 mm OD and 46 mm width from the ISO 15 general plan. At 4,100 r/min with oil versus 3,500 r/min with grease (a 600 r/min band), lubrication choice for NUP2220 is a thermal decision, not just a sealing one. The 100 mm (3.937 in) bore and 180 mm (7.087 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 46 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2220.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The 40.0 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NUP2220 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "Grease limiting speed 3,500 r/min and oil 4,100 r/min are different limits for NUP2220: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 286/340 kN ratings, 37.5 kN Pu and 4480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2220 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2220?", "a": "NUP2220 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 340 kN, Pu 37.5 kN, grease limiting speed 3,500 r/min, oil 4,100 r/min, mass about 4480 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2220 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2220 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2220 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2220?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 120 mm, Ew 160 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,500 r/min grease / 4,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2220-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2220", "NUP2220" ], "locale_variants": {} }, { "sku": "NUP2220E", "brand": "NTN", "manufacturer_designation": "NTN NUP2220E", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 445, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2220E appears as a 100 mm bore single-row cylindrical roller bearing (370 kN C / 445 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Digit by digit, NUP2220E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2220E. The 100 mm (3.937 in) bore and 180 mm (7.087 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 46 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 180 mm raceway.", "The NUP rib arrangement is not interchangeable with another prefix on the same 100 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 180×46 mm envelope matches.", "Do not replace NUP2220E with a deep-groove ball bearing on rating alone: line contact gives 370 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NUP2220E with a deep-groove ball bearing on rating alone: line contact gives 370 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 370/445 kN ratings, 49 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2220E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2220E?", "a": "NUP2220E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 445 kN, Pu 49 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2220E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2220E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2220E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2220E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119 mm. The nominal bore/OD remain 100/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2220E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2220e", "NUP2220E" ], "locale_variants": {} }, { "sku": "N2320", "brand": "NTN", "manufacturer_designation": "NTN N2320", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 455, "static_load_kN": 505, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2320 on the 100×215 mm envelope, 73 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,900 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 100 mm, with 215 mm OD and 73 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 129.5 mm and Ew 185.5 mm — the envelope inside the 100/215 mm bore/OD where the rollers actually run. Rating life at 455 kN C assumes clean oil and adequate film; the 54 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2320 skids at 2,900 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 455/505 kN pair here belongs to N2320 as printed, not to the bare size.", "Open N2320 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "The N rib arrangement is not interchangeable with another prefix on the same 100 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 215×73 mm envelope matches.", "The 455/505 kN ratings, 54 kN Pu and 11500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2320?", "a": "N2320 is an NTN N single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 505 kN, Pu 54 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 11500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2320 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2320 is supplied in the standard open execution shown in the table." }, { "q": "Can N2320 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2320", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2320", "N2320" ], "locale_variants": {} }, { "sku": "N320", "brand": "NTN", "manufacturer_designation": "NTN N320", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 335, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 7320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N320 appears as a 100 mm bore single-row cylindrical roller bearing (330 kN C / 335 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 100 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats N320 as a pure radial bearing: keep P below 330 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of N320; an oversized radius locks the ring on its face and tilts the 47 mm-wide seat.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "The 47 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "Do not replace N320 with a deep-groove ball bearing on rating alone: line contact gives 330 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 47 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 330/335 kN pair here belongs to N320 as printed, not to the bare size.", "The 330/335 kN ratings, 36 kN Pu and 7320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N320?", "a": "N320 is an NTN N single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 335 kN, Pu 36 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 7320 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N320 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N320 is supplied in the standard open execution shown in the table." }, { "q": "Can N320 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N320-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n320", "N320" ], "locale_variants": {} }, { "sku": "NF320", "brand": "NTN", "manufacturer_designation": "NTN NF320", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 335, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 7320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 100 mm shaft NTN supplies NF320: one integral rib on each ring; the open execution is rated 3,300 r/min on grease and 3,800 r/min on oil. Numbering ties NF320 to its envelope: type code NF, series NF300, 100 mm bore; the 215×47 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NF320 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 330 kN C assumes clean oil and adequate film; the 36 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF320 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "Do not replace NF320 with a deep-groove ball bearing on rating alone: line contact gives 330 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 3,300 r/min and oil 3,800 r/min are different limits for NF320: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NF320 with a deep-groove ball bearing on rating alone: line contact gives 330 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 330/335 kN ratings, 36 kN Pu and 7320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF320?", "a": "NF320 is an NTN NF single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 335 kN, Pu 36 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 7320 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF320 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF320 is supplied in the standard open execution shown in the table." }, { "q": "Can NF320 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF320", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf320", "NF320" ], "locale_variants": {} }, { "sku": "NJ2320", "brand": "NTN", "manufacturer_designation": "NTN NJ2320", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 455, "static_load_kN": 505, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2320 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 100×215×73 mm ISO 15 envelope. Numbering ties NJ2320 to its envelope: type code NJ, series NJ2300, 100 mm bore; the 215×73 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 4.5 kN-per-mm-bore figure (455 kN over 100 mm) lets a NJ2320 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 100 mm shaft.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NJ2320 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 455/505 kN pair here belongs to NJ2320 as printed, not to the bare size.", "The 455/505 kN ratings, 54 kN Pu and 11500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2320?", "a": "NJ2320 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 505 kN, Pu 54 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 11500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2320 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2320 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2320 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2320-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2320", "NJ2320" ], "locale_variants": {} }, { "sku": "NJ2320E", "brand": "NTN", "manufacturer_designation": "NTN NJ2320E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 630, "static_load_kN": 715, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2320E on the 100×215 mm envelope, 73 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,600 r/min. Digit by digit, NJ2320E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NJ2320E designation when purchasing. The 6.3 kN-per-mm-bore figure (630 kN over 100 mm) lets a NJ2320E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2320E non-locating position preloads the bearing when the shaft grows.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 630/715 kN pair here belongs to NJ2320E as printed, not to the bare size.", "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2320E skids at 2,600 r/min and fails by smearing long before L10 fatigue.", "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "The 630/715 kN ratings, 76 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2320E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2320E?", "a": "NJ2320E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 630 kN, C0 715 kN, Pu 76 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2320E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2320E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2320E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2320E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 127.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2320E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2320e", "NJ2320E" ], "locale_variants": {} }, { "sku": "NJ320", "brand": "NTN", "manufacturer_designation": "NTN NJ320", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 335, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 7320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ320 is the standard section of the NTN NJ300 dimension series for a 100 mm shaft — 330 kN of basic dynamic capacity in a 7320 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 100 mm, with 215 mm OD and 47 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NJ320 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 3,300 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,800 r/min for continuously high-duty 100 mm positions. Housing and shaft fillets must clear the ring chamfers of NJ320; an oversized radius locks the ring on its face and tilts the 47 mm-wide seat.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "Grease limiting speed 3,300 r/min and oil 3,800 r/min are different limits for NJ320: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 47 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 330/335 kN pair here belongs to NJ320 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 330/335 kN ratings, 36 kN Pu and 7320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ320?", "a": "NJ320 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 335 kN, Pu 36 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 7320 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ320 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ320 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ320 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ320-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj320", "NJ320" ], "locale_variants": {} }, { "sku": "NJ320E", "brand": "NTN", "manufacturer_designation": "NTN NJ320E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 420, "static_load_kN": 425, "fatigue_load_limit_kN": 45, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 100 mm shaft NTN supplies NJ320E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,900 r/min on grease and 3,500 r/min on oil. Digit by digit, NJ320E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 100 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,900 r/min grease and 3,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 100 mm bore. Speed ratio check: limiting 2,900 r/min is .83 of the 3,500 r/min oil value for NJ320E; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ320E non-locating position preloads the bearing when the shaft grows.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 47 mm-wide cavity.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 47 mm-wide cavity.", "The 47 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "If the shaft must be located both ways, do not use NJ320E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 420/425 kN ratings, 45 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ320E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ320E?", "a": "NJ320E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 425 kN, Pu 45 kN, grease limiting speed 2,900 r/min, oil 3,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ320E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ320E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ320E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ320E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 127.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ320E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj320e", "NJ320E" ], "locale_variants": {} }, { "sku": "NU2320", "brand": "NTN", "manufacturer_designation": "NTN NU2320", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 455, "static_load_kN": 505, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2320 is the extra-wide (23) section of the NTN NU2300 dimension series for a 100 mm shaft — 455 kN of basic dynamic capacity in a 11500 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 100 mm (00–03 use the 10/12/15/17 exception table). With C 455 kN and C0 505 kN (C0/C ≈ 1.11) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 2,900 r/min is .85 of the 3,400 r/min oil value for NU2320; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2320.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "If the shaft must be located both ways, do not use NU2320 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 455/505 kN pair here belongs to NU2320 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NU2320 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2320 skids at 2,900 r/min and fails by smearing long before L10 fatigue.", "The 455/505 kN ratings, 54 kN Pu and 11500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2320?", "a": "NU2320 is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 505 kN, Pu 54 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 11500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2320 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2320 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2320 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2320-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2320", "NU2320" ], "locale_variants": {} }, { "sku": "NU2320E", "brand": "NTN", "manufacturer_designation": "NTN NU2320E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 630, "static_load_kN": 715, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2320E appears as a 100 mm bore single-row cylindrical roller bearing (630 kN C / 715 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2320E floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. The 73 mm width and 57.5 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 100 mm (3.937 in) bore and 215 mm (8.465 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 73 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.", "Do not replace NU2320E with a deep-groove ball bearing on rating alone: line contact gives 630 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "Open NU2320E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "The 630/715 kN ratings, 76 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2320E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2320E?", "a": "NU2320E is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 630 kN, C0 715 kN, Pu 76 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2320E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2320E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2320E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2320E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 127.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2320E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2320e", "NU2320E" ], "locale_variants": {} }, { "sku": "NU320-NTN", "brand": "NTN", "manufacturer_designation": "NTN NU320", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 335, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 7320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU320 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 330 kN dynamic rating in the 100 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU320 floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. With C 330 kN and C0 335 kN (C0/C ≈ 1.02) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Equivalent-load planning treats NU320 as a pure radial bearing: keep P below 330 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU320 non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 47 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 100 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 47 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU320 skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "The 330/335 kN ratings, 36 kN Pu and 7320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU320?", "a": "NU320 is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 335 kN, Pu 36 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 7320 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU320 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU320 is supplied in the standard open execution shown in the table." }, { "q": "Can NU320 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU320", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu320", "NU320", "NU320-NTN" ], "locale_variants": {} }, { "sku": "NU320E", "brand": "NTN", "manufacturer_designation": "NTN NU320E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 420, "static_load_kN": 425, "fatigue_load_limit_kN": 45, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU320E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 100×215×47 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 100 mm, with 215 mm OD and 47 mm width from the ISO 15 general plan. The 47 mm width and 57.5 mm section put the NU300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 2,900 r/min is .83 of the 3,500 r/min oil value for NU320E; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NU320E; an oversized radius locks the ring on its face and tilts the 47 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "Open NU320E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "Grease limiting speed 2,900 r/min and oil 3,500 r/min are different limits for NU320E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 47 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "Open NU320E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "The 420/425 kN ratings, 45 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU320E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU320E?", "a": "NU320E is an NTN NU single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 425 kN, Pu 45 kN, grease limiting speed 2,900 r/min, oil 3,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU320E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU320E is supplied in the standard open execution shown in the table." }, { "q": "Can NU320E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU320E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 127.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU320E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu320e", "NU320E" ], "locale_variants": {} }, { "sku": "NUP2320", "brand": "NTN", "manufacturer_designation": "NTN NUP2320", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 455, "static_load_kN": 505, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2320 denotes a 100×215×73 mm (3.937 × 8.465 × 2.874 in) cylindrical roller bearing in the NUP2300 family, a pressed sheet-steel cage. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 100 mm (00–03 use the 10/12/15/17 exception table). The 57.5 mm radial section ((215−100)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. Selection arithmetic: Pu 54 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.11 (505/455 kN) shows the high-static-capacity proportioning of this 100 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 100 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "If the shaft must be located both ways, do not use NUP2320 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NUP rib arrangement is not interchangeable with another prefix on the same 100 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 215×73 mm envelope matches.", "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.", "The 455/505 kN ratings, 54 kN Pu and 11500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2320?", "a": "NUP2320 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 505 kN, Pu 54 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 11500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2320 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2320 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2320 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2320-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2320", "NUP2320" ], "locale_variants": {} }, { "sku": "NUP2320E", "brand": "NTN", "manufacturer_designation": "NTN NUP2320E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 630, "static_load_kN": 715, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2320E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 630 kN dynamic rating in the 100 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 100 mm (00–03 use the 10/12/15/17 exception table). the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NUP2320E designation when purchasing. Thermal planning around the 2,600 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 3,100 r/min for continuously high-duty 100 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2320E non-locating position preloads the bearing when the shaft grows.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "Do not replace NUP2320E with a deep-groove ball bearing on rating alone: line contact gives 630 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NUP2320E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.", "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "The 630/715 kN ratings, 76 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2320E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2320E?", "a": "NUP2320E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 630 kN, C0 715 kN, Pu 76 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2320E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2320E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2320E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2320E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 127.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2320E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2320e", "NUP2320E" ], "locale_variants": {} }, { "sku": "NUP320", "brand": "NTN", "manufacturer_designation": "NTN NUP320", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 335, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3800, "weight_g": 7320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP320 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 330 kN dynamic rating in the 100 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP320 floats or locates; the numeric remainder is the ISO 15 series and 100 mm bore reference, not a fit or clearance instruction. The 57.5 mm radial section ((215−100)/2) frames the roller complement; capacity per millimetre of bore is about 3.3 kN/mm before application factors. Mass 7320 g for the 100×215×47 mm NUP320 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 100 mm shaft.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "Do not replace NUP320 with a deep-groove ball bearing on rating alone: line contact gives 330 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NUP320 with a deep-groove ball bearing on rating alone: line contact gives 330 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Open NUP320 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "The 57.5 mm section at 100 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 47 mm-wide cavity.", "The 330/335 kN ratings, 36 kN Pu and 7320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP320 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP320?", "a": "NUP320 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 335 kN, Pu 36 kN, grease limiting speed 3,300 r/min, oil 3,800 r/min, mass about 7320 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP320 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP320 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP320 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP320?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 129.5 mm, Ew 185.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP320-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup320", "NUP320" ], "locale_variants": {} }, { "sku": "NUP320E", "brand": "NTN", "manufacturer_designation": "NTN NUP320E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 420, "static_load_kN": 425, "fatigue_load_limit_kN": 45, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP320E on the 100×215 mm envelope, 47 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,900 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 100 mm, with 215 mm OD and 47 mm width from the ISO 15 general plan. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NUP320E designation when purchasing. Selection arithmetic: Pu 45 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.01 (425/420 kN) shows the high-static-capacity proportioning of this 100 mm bore. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 100 mm shaft.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 100 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 215 mm raceway.", "Open NUP320E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 100 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "The 47 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 100 mm inner ring.", "The 420/425 kN ratings, 45 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP320E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP320E?", "a": "NUP320E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 425 kN, Pu 45 kN, grease limiting speed 2,900 r/min, oil 3,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP320E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP320E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP320E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP320E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 127.5 mm. The nominal bore/OD remain 100/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP320E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup320e", "NUP320E" ], "locale_variants": {} }, { "sku": "NN4921", "brand": "NTN", "manufacturer_designation": "NTN NN4921", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 145, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 147, "static_load_kN": 268, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 1820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 105 mm shaft NTN supplies NN4921: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,100 r/min on grease and 4,800 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 105 mm, with 145 mm OD and 40 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NN4921 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 1.4 kN-per-mm-bore figure (147 kN over 105 mm) lets a NN4921 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 105 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "Do not replace NN4921 with a deep-groove ball bearing on rating alone: line contact gives 147 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NN4921 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 105 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 147/268 kN pair here belongs to NN4921 as printed, not to the bare size.", "Do not replace NN4921 with a deep-groove ball bearing on rating alone: line contact gives 147 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 147/268 kN ratings, 30.5 kN Pu and 1820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4921 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4921?", "a": "NN4921 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 105 mm bore, 145 mm OD and 40 mm width (4.134 × 5.709 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 147 kN, C0 268 kN, Pu 30.5 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 1820 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4921 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4921 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4921?", "a": "NN4921 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN4921?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 118 mm. The nominal bore/OD remain 105/145 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4921", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4921", "NN4921" ], "locale_variants": {} }, { "sku": "NN4921K", "brand": "NTN", "manufacturer_designation": "NTN NN4921K", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 145, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 147, "static_load_kN": 268, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 1730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 105 mm shaft NTN supplies NN4921K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 4,100 r/min on grease and 4,800 r/min on oil. Digit by digit, NN4921K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 105 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 20.0 mm radial section ((145−105)/2) frames the roller complement; capacity per millimetre of bore is about 1.4 kN/mm before application factors. Mass 1730 g for the 105×145×40 mm NN4921K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4921K skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 145 mm race brinells and releases as vibration within hours.", "The NN rib arrangement is not interchangeable with another prefix on the same 105 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 145×40 mm envelope matches.", "The 20.0 mm section at 105 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 147/268 kN ratings, 30.5 kN Pu and 1730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4921K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4921K?", "a": "NN4921K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 105 mm bore, 145 mm OD and 40 mm width (4.134 × 5.709 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 147 kN, C0 268 kN, Pu 30.5 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 1730 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4921K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4921K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4921K?", "a": "The K suffix denotes a 1:12 tapered bore. NN4921K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4921 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN4921K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 118 mm. The nominal bore/OD remain 105/145 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4921K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4921k", "NN4921K" ], "locale_variants": {} }, { "sku": "NNU4921K", "brand": "NTN", "manufacturer_designation": "NTN NNU4921K", "series": "NNU4900-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 145, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 147, "static_load_kN": 268, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 1820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NNU4921K denotes a 105×145×40 mm (4.134 × 5.709 × 1.575 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 105 mm, with 145 mm OD and 40 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NNU4921K. The 1.4 kN-per-mm-bore figure (147 kN over 105 mm) lets a NNU4921K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NNU4921K; an oversized radius locks the ring on its face and tilts the 40 mm-wide seat.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 145 mm raceway.", "The 20.0 mm section at 105 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4921K skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The K tapered bore of NNU4921K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 145 mm race brinells and releases as vibration within hours.", "The 147/268 kN ratings, 30.5 kN Pu and 1820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4921K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNU4921K?", "a": "NNU4921K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 105 mm bore, 145 mm OD and 40 mm width (4.134 × 5.709 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 147 kN, C0 268 kN, Pu 30.5 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 1820 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4921K is the NNU execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4921K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4921K?", "a": "The K suffix denotes a 1:12 tapered bore. NNU4921K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4921 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NNU4921K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 118 mm. The nominal bore/OD remain 105/145 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NNU4921K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nnu4921k", "NNU4921K" ], "locale_variants": {} }, { "sku": "N1021", "brand": "NTN", "manufacturer_designation": "NTN N1021", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 117, "static_load_kN": 142, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5100, "weight_g": 1810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1021 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 117 kN dynamic rating in the 105 mm bore. Numbering ties N1021 to its envelope: type code N, series N1000, 105 mm bore; the 160×26 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N1021 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 26 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 105 mm inner ring.", "If the shaft must be located both ways, do not use N1021 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Do not replace N1021 with a deep-groove ball bearing on rating alone: line contact gives 117 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 117/142 kN ratings, 16 kN Pu and 1810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1021 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1021?", "a": "N1021 is an NTN N single-row cylindrical roller bearing to ISO 15: 105 mm bore, 160 mm OD and 26 mm width (4.134 × 6.299 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 142 kN, Pu 16 kN, grease limiting speed 4,300 r/min, oil 5,100 r/min, mass about 1810 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1021 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1021 is supplied in the standard open execution shown in the table." }, { "q": "Can N1021 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1021?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119.5 mm, Ew 145.5 mm. The nominal bore/OD remain 105/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1021", "N1021" ], "locale_variants": {} }, { "sku": "NJ1021", "brand": "NTN", "manufacturer_designation": "NTN NJ1021", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 117, "static_load_kN": 142, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5100, "weight_g": 1810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 105 mm shaft NTN supplies NJ1021: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 4,300 r/min on grease and 5,100 r/min on oil. Digit by digit, NJ1021 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 105 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1021. Rating life at 117 kN C assumes clean oil and adequate film; the 16 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 105 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1021 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1021 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "The 117/142 kN ratings, 16 kN Pu and 1810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1021 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1021?", "a": "NJ1021 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 105 mm bore, 160 mm OD and 26 mm width (4.134 × 6.299 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 142 kN, Pu 16 kN, grease limiting speed 4,300 r/min, oil 5,100 r/min, mass about 1810 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1021 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1021 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1021 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1021?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119.5 mm, Ew 145.5 mm. The nominal bore/OD remain 105/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1021", "NJ1021" ], "locale_variants": {} }, { "sku": "NN3021", "brand": "NTN", "manufacturer_designation": "NTN NN3021", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 160, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 220, "static_load_kN": 320, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 2890, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3021 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 105×160×41 mm ISO 15 envelope. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3021 floats or locates; the numeric remainder is the ISO 15 series and 105 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NN3021 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 2890 g for the 105×160×41 mm NN3021 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3021.", "applications": [ "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 220/320 kN pair here belongs to NN3021 as printed, not to the bare size.", "Open NN3021 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 105 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 220/320 kN pair here belongs to NN3021 as printed, not to the bare size.", "Do not replace NN3021 with a deep-groove ball bearing on rating alone: line contact gives 220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 220/320 kN ratings, 36 kN Pu and 2890 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3021 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3021?", "a": "NN3021 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 105 mm bore, 160 mm OD and 41 mm width (4.134 × 6.299 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 220 kN, C0 320 kN, Pu 36 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 2890 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3021 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3021 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3021?", "a": "NN3021 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3021?", "a": "NTN rates NN3021 at 3,800 r/min with grease and 4,500 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3021", "NN3021" ], "locale_variants": {} }, { "sku": "NN3021K", "brand": "NTN", "manufacturer_designation": "NTN NN3021K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 160, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 220, "static_load_kN": 320, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3021K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 105×160×41 mm ISO 15 envelope. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 105 mm (00–03 use the 10/12/15/17 exception table). At 4,500 r/min with oil versus 3,800 r/min with grease (a 700 r/min band), lubrication choice for NN3021K is a thermal decision, not just a sealing one. Mass 2800 g for the 105×160×41 mm NN3021K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NN3021K; an oversized radius locks the ring on its face and tilts the 41 mm-wide seat.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "The 27.5 mm section at 105 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 41 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3021K skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 220/320 kN pair here belongs to NN3021K as printed, not to the bare size.", "Grease limiting speed 3,800 r/min and oil 4,500 r/min are different limits for NN3021K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 220/320 kN ratings, 36 kN Pu and 2800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3021K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3021K?", "a": "NN3021K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 105 mm bore, 160 mm OD and 41 mm width (4.134 × 6.299 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 220 kN, C0 320 kN, Pu 36 kN, grease limiting speed 3,800 r/min, oil 4,500 r/min, mass about 2800 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3021K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3021K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3021K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3021K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3021 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3021K?", "a": "NTN rates NN3021K at 3,800 r/min with grease and 4,500 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3021K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3021k", "NN3021K" ], "locale_variants": {} }, { "sku": "NU1021", "brand": "NTN", "manufacturer_designation": "NTN NU1021", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 117, "static_load_kN": 142, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5100, "weight_g": 1810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1021 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 105×160×26 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1021 floats or locates; the numeric remainder is the ISO 15 series and 105 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 4,300 r/min grease and 5,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 105 mm bore. Selection arithmetic: Pu 16 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.21 (142/117 kN) shows the high-static-capacity proportioning of this 105 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1021.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Wide (22/23) and light (10/49) executions at 105 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NU1021 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1021 skids at 4,300 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NU1021 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 117/142 kN ratings, 16 kN Pu and 1810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1021 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1021?", "a": "NU1021 is an NTN NU single-row cylindrical roller bearing to ISO 15: 105 mm bore, 160 mm OD and 26 mm width (4.134 × 6.299 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 142 kN, Pu 16 kN, grease limiting speed 4,300 r/min, oil 5,100 r/min, mass about 1810 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1021 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1021 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1021 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1021?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119.5 mm, Ew 145.5 mm. The nominal bore/OD remain 105/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1021-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1021", "NU1021" ], "locale_variants": {} }, { "sku": "NUP1021", "brand": "NTN", "manufacturer_designation": "NTN NUP1021", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 117, "static_load_kN": 142, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 4300, "max_rpm": 4300, "speed_oil_rpm": 5100, "weight_g": 1810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1021 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 105×160×26 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1021 floats or locates; the numeric remainder is the ISO 15 series and 105 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP1021 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 105 mm (4.134 in) bore and 160 mm (6.299 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 26 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP1021; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 160 mm raceway.", "Wide (22/23) and light (10/49) executions at 105 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.", "Open NUP1021 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 105 mm contact.", "Do not replace NUP1021 with a deep-groove ball bearing on rating alone: line contact gives 117 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 117/142 kN ratings, 16 kN Pu and 1810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1021 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1021?", "a": "NUP1021 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 105 mm bore, 160 mm OD and 26 mm width (4.134 × 6.299 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 117 kN, C0 142 kN, Pu 16 kN, grease limiting speed 4,300 r/min, oil 5,100 r/min, mass about 1810 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1021 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1021 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1021 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1021?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 119.5 mm, Ew 145.5 mm. The nominal bore/OD remain 105/160 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,300 r/min grease / 5,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1021", "NUP1021" ], "locale_variants": {} }, { "sku": "N221", "brand": "NTN", "manufacturer_designation": "NTN N221", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 223, "static_load_kN": 241, "fatigue_load_limit_kN": 26.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3870, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N221 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 105×190×36 mm ISO 15 envelope. Numbering ties N221 to its envelope: type code N, series N200, 105 mm bore; the 190×36 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 36 mm width and 42.5 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 2.1 kN-per-mm-bore figure (223 kN over 105 mm) lets a N221 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 105 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use N221 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use N221 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open N221 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 105 mm contact.", "The 223/241 kN ratings, 26.1 kN Pu and 3870 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N221 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N221?", "a": "N221 is an NTN N single-row cylindrical roller bearing to ISO 15: 105 mm bore, 190 mm OD and 36 mm width (4.134 × 7.48 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 223 kN, C0 241 kN, Pu 26.1 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3870 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N221 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N221 is supplied in the standard open execution shown in the table." }, { "q": "Can N221 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N221?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 126.8 mm, Ew 168.8 mm. The nominal bore/OD remain 105/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N221-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n221", "N221" ], "locale_variants": {} }, { "sku": "NF221", "brand": "NTN", "manufacturer_designation": "NTN NF221", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 223, "static_load_kN": 241, "fatigue_load_limit_kN": 26.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3870, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF221 is the standard section of the NTN NF200 dimension series for a 105 mm shaft — 223 kN of basic dynamic capacity in a 3870 g, open bearing. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF221 floats or locates; the numeric remainder is the ISO 15 series and 105 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 3,600 r/min grease and 4,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 105 mm bore. Speed ratio check: limiting 3,600 r/min is .84 of the 4,300 r/min oil value for NF221; grease-churn heating closes that gap as fill quantity rises. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "If the shaft must be located both ways, do not use NF221 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 223/241 kN pair here belongs to NF221 as printed, not to the bare size.", "The NF rib arrangement is not interchangeable with another prefix on the same 105 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 190×36 mm envelope matches.", "If the shaft must be located both ways, do not use NF221 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 223/241 kN ratings, 26.1 kN Pu and 3870 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF221 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF221?", "a": "NF221 is an NTN NF single-row cylindrical roller bearing to ISO 15: 105 mm bore, 190 mm OD and 36 mm width (4.134 × 7.48 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 223 kN, C0 241 kN, Pu 26.1 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3870 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF221 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF221 is supplied in the standard open execution shown in the table." }, { "q": "Can NF221 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF221?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 126.8 mm, Ew 168.8 mm. The nominal bore/OD remain 105/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF221", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf221", "NF221" ], "locale_variants": {} }, { "sku": "NJ221", "brand": "NTN", "manufacturer_designation": "NTN NJ221", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 223, "static_load_kN": 241, "fatigue_load_limit_kN": 26.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3870, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ221 on the 105×190 mm envelope, 36 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,600 r/min. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ221 floats or locates; the numeric remainder is the ISO 15 series and 105 mm bore reference, not a fit or clearance instruction. The 36 mm width and 42.5 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 2.1 kN-per-mm-bore figure (223 kN over 105 mm) lets a NJ221 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 105 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ221 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 105 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 223/241 kN pair here belongs to NJ221 as printed, not to the bare size.", "Open NJ221 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 105 mm contact.", "The 223/241 kN ratings, 26.1 kN Pu and 3870 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ221 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ221?", "a": "NJ221 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 105 mm bore, 190 mm OD and 36 mm width (4.134 × 7.48 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 223 kN, C0 241 kN, Pu 26.1 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3870 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ221 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ221 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ221 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ221?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 126.8 mm, Ew 168.8 mm. The nominal bore/OD remain 105/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ221-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj221", "NJ221" ], "locale_variants": {} }, { "sku": "NU221", "brand": "NTN", "manufacturer_designation": "NTN NU221", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 223, "static_load_kN": 241, "fatigue_load_limit_kN": 26.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3870, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU221 appears as a 105 mm bore single-row cylindrical roller bearing (223 kN C / 241 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 105 mm, with 190 mm OD and 36 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Mass 3870 g for the 105×190×36 mm NU221 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 105 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU221 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 105 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NU221 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 223/241 kN pair here belongs to NU221 as printed, not to the bare size.", "The 223/241 kN ratings, 26.1 kN Pu and 3870 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU221 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU221?", "a": "NU221 is an NTN NU single-row cylindrical roller bearing to ISO 15: 105 mm bore, 190 mm OD and 36 mm width (4.134 × 7.48 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 223 kN, C0 241 kN, Pu 26.1 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3870 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU221 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU221 is supplied in the standard open execution shown in the table." }, { "q": "Can NU221 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU221?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 126.8 mm, Ew 168.8 mm. The nominal bore/OD remain 105/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU221-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu221", "NU221" ], "locale_variants": {} }, { "sku": "NUP221", "brand": "NTN", "manufacturer_designation": "NTN NUP221", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 223, "static_load_kN": 241, "fatigue_load_limit_kN": 26.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3870, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP221 denotes a 105×190×36 mm (4.134 × 7.48 × 1.417 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 105 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NUP221 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 3,600 r/min is .84 of the 4,300 r/min oil value for NUP221; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP221.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.", "Open NUP221 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 105 mm contact.", "If the shaft must be located both ways, do not use NUP221 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NUP221 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 105 mm contact.", "Wide (22/23) and light (10/49) executions at 105 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 223/241 kN ratings, 26.1 kN Pu and 3870 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP221 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP221?", "a": "NUP221 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 105 mm bore, 190 mm OD and 36 mm width (4.134 × 7.48 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 223 kN, C0 241 kN, Pu 26.1 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3870 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP221 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP221 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP221 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP221?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 126.8 mm, Ew 168.8 mm. The nominal bore/OD remain 105/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP221-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup221", "NUP221" ], "locale_variants": {} }, { "sku": "N321", "brand": "NTN", "manufacturer_designation": "NTN N321", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 355, "static_load_kN": 360, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 8330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N321 on the 105×225 mm envelope, 49 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,100 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 105 mm, with 225 mm OD and 49 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,100 r/min grease and 3,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 105 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Heat the inner ring to max 120 °C for the 105 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 225 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N321 skids at 3,100 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 355/360 kN pair here belongs to N321 as printed, not to the bare size.", "The N rib arrangement is not interchangeable with another prefix on the same 105 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 225×49 mm envelope matches.", "If the shaft must be located both ways, do not use N321 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 355/360 kN ratings, 37.5 kN Pu and 8330 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N321 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N321?", "a": "N321 is an NTN N single-row cylindrical roller bearing to ISO 15: 105 mm bore, 225 mm OD and 49 mm width (4.134 × 8.858 × 1.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 360 kN, Pu 37.5 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 8330 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N321 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N321 is supplied in the standard open execution shown in the table." }, { "q": "Can N321 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N321?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 195 mm. The nominal bore/OD remain 105/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N321-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n321", "N321" ], "locale_variants": {} }, { "sku": "NF321", "brand": "NTN", "manufacturer_designation": "NTN NF321", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 355, "static_load_kN": 360, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 8330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF321 denotes a 105×225×49 mm (4.134 × 8.858 × 1.929 in) cylindrical roller bearing in the NF300 family, a pressed sheet-steel cage. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 105 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF321. Equivalent-load planning treats NF321 as a pure radial bearing: keep P below 355 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NF321; an oversized radius locks the ring on its face and tilts the 49 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 225 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 225 mm race brinells and releases as vibration within hours.", "The 49 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 105 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 355/360 kN pair here belongs to NF321 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 225 mm race brinells and releases as vibration within hours.", "The 355/360 kN ratings, 37.5 kN Pu and 8330 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF321 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF321?", "a": "NF321 is an NTN NF single-row cylindrical roller bearing to ISO 15: 105 mm bore, 225 mm OD and 49 mm width (4.134 × 8.858 × 1.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 360 kN, Pu 37.5 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 8330 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF321 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF321 is supplied in the standard open execution shown in the table." }, { "q": "Can NF321 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF321?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 195 mm. The nominal bore/OD remain 105/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF321", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf321", "NF321" ], "locale_variants": {} }, { "sku": "NJ321", "brand": "NTN", "manufacturer_designation": "NTN NJ321", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 355, "static_load_kN": 360, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 8330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 105 mm shaft NTN supplies NJ321: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,100 r/min on grease and 3,700 r/min on oil. Digit by digit, NJ321 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 105 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ321. The 105 mm (4.134 in) bore and 225 mm (8.858 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 49 mm-wide ring. Heat the inner ring to max 120 °C for the 105 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 225 mm raceway.", "Wide (22/23) and light (10/49) executions at 105 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NJ rib arrangement is not interchangeable with another prefix on the same 105 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 225×49 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 225 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 225 mm race brinells and releases as vibration within hours.", "The 355/360 kN ratings, 37.5 kN Pu and 8330 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ321 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ321?", "a": "NJ321 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 105 mm bore, 225 mm OD and 49 mm width (4.134 × 8.858 × 1.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 360 kN, Pu 37.5 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 8330 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ321 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ321 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ321 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ321?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 195 mm. The nominal bore/OD remain 105/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ321-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj321", "NJ321" ], "locale_variants": {} }, { "sku": "NU321", "brand": "NTN", "manufacturer_designation": "NTN NU321", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 355, "static_load_kN": 360, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 8330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU321 is the standard section of the NTN NU300 dimension series for a 105 mm shaft — 355 kN of basic dynamic capacity in a 8330 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 105 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU321 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NU321 as a pure radial bearing: keep P below 355 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 105 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 225 mm raceway.", "Wide (22/23) and light (10/49) executions at 105 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NU rib arrangement is not interchangeable with another prefix on the same 105 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 225×49 mm envelope matches.", "The 60.0 mm section at 105 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 49 mm-wide cavity.", "Do not replace NU321 with a deep-groove ball bearing on rating alone: line contact gives 355 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 355/360 kN ratings, 37.5 kN Pu and 8330 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU321 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU321?", "a": "NU321 is an NTN NU single-row cylindrical roller bearing to ISO 15: 105 mm bore, 225 mm OD and 49 mm width (4.134 × 8.858 × 1.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 360 kN, Pu 37.5 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 8330 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU321 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU321 is supplied in the standard open execution shown in the table." }, { "q": "Can NU321 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU321?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 195 mm. The nominal bore/OD remain 105/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU321-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu321", "NU321" ], "locale_variants": {} }, { "sku": "NUP321", "brand": "NTN", "manufacturer_designation": "NTN NUP321", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 355, "static_load_kN": 360, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 8330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP321 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 105×225×49 mm ISO 15 envelope. Numbering ties NUP321 to its envelope: type code NUP, series NUP300, 105 mm bore; the 225×49 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP321 designation when purchasing. Thermal planning around the 3,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,700 r/min for continuously high-duty 105 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP321.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 105 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 225 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 225 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 355/360 kN pair here belongs to NUP321 as printed, not to the bare size.", "Grease limiting speed 3,100 r/min and oil 3,700 r/min are different limits for NUP321: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 49 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 105 mm inner ring.", "The 355/360 kN ratings, 37.5 kN Pu and 8330 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP321 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP321?", "a": "NUP321 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 105 mm bore, 225 mm OD and 49 mm width (4.134 × 8.858 × 1.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 360 kN, Pu 37.5 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 8330 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP321 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP321 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP321 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP321?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 195 mm. The nominal bore/OD remain 105/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP321", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup321", "NUP321" ], "locale_variants": {} }, { "sku": "NN4922", "brand": "NTN", "manufacturer_designation": "NTN NN4922", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 152, "static_load_kN": 284, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN4922 denotes a 110×150×40 mm (4.331 × 5.906 × 1.575 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN4922 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 152 kN and C0 284 kN (C0/C ≈ 1.87) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Selection arithmetic: Pu 32 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.87 (284/152 kN) shows the high-static-capacity proportioning of this 110 mm bore. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Grease limiting speed 3,900 r/min and oil 4,600 r/min are different limits for NN4922: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 150 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4922 skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "The 152/284 kN ratings, 32 kN Pu and 1900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4922 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4922?", "a": "NN4922 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 110 mm bore, 150 mm OD and 40 mm width (4.331 × 5.906 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 152 kN, C0 284 kN, Pu 32 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 1900 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4922 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4922 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4922?", "a": "NN4922 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN4922?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 123 mm. The nominal bore/OD remain 110/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4922", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4922", "NN4922" ], "locale_variants": {} }, { "sku": "NN4922K", "brand": "NTN", "manufacturer_designation": "NTN NN4922K", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 152, "static_load_kN": 284, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 1810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN4922K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 110×150×40 mm ISO 15 envelope. Numbering ties NN4922K to its envelope: type code NN, series NN4900, 110 mm bore; the 150×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 1.4 kN-per-mm-bore figure (152 kN over 110 mm) lets a NN4922K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Grease limiting speed 3,900 r/min and oil 4,600 r/min are different limits for NN4922K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NN4922K with a deep-groove ball bearing on rating alone: line contact gives 152 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 20.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 152/284 kN pair here belongs to NN4922K as printed, not to the bare size.", "The 152/284 kN ratings, 32 kN Pu and 1810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4922K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4922K?", "a": "NN4922K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 110 mm bore, 150 mm OD and 40 mm width (4.331 × 5.906 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 152 kN, C0 284 kN, Pu 32 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 1810 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4922K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4922K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4922K?", "a": "The K suffix denotes a 1:12 tapered bore. NN4922K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4922 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN4922K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 123 mm. The nominal bore/OD remain 110/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4922K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4922k", "NN4922K" ], "locale_variants": {} }, { "sku": "NNU4922K", "brand": "NTN", "manufacturer_designation": "NTN NNU4922K", "series": "NNU4900-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 152, "static_load_kN": 284, "fatigue_load_limit_kN": 32, "limiting_speed_rpm": 3900, "max_rpm": 3900, "speed_oil_rpm": 4600, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NNU4922K appears as a 110 mm bore single-row cylindrical roller bearing (152 kN C / 284 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4922K floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NNU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NNU4922K non-locating position preloads the bearing when the shaft grows.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 150 mm raceway.", "Wide (22/23) and light (10/49) executions at 110 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4922K skids at 3,900 r/min and fails by smearing long before L10 fatigue.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "The 152/284 kN ratings, 32 kN Pu and 1900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4922K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNU4922K?", "a": "NNU4922K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 110 mm bore, 150 mm OD and 40 mm width (4.331 × 5.906 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 152 kN, C0 284 kN, Pu 32 kN, grease limiting speed 3,900 r/min, oil 4,600 r/min, mass about 1900 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4922K is the NNU execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4922K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4922K?", "a": "The K suffix denotes a 1:12 tapered bore. NNU4922K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4922 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NNU4922K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 123 mm. The nominal bore/OD remain 110/150 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,900 r/min grease / 4,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NNU4922K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nnu4922k", "NNU4922K" ], "locale_variants": {} }, { "sku": "N1022", "brand": "NTN", "manufacturer_designation": "NTN N1022", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 174, "fatigue_load_limit_kN": 19.2, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1022 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 110×170×28 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 110 mm (00–03 use the 10/12/15/17 exception table). With C 146 kN and C0 174 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Mass 2300 g for the 110×170×28 mm N1022 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 110 mm shaft.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1022 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The 30.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "Open N1022 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1022 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The 146/174 kN ratings, 19.2 kN Pu and 2300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1022 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1022?", "a": "N1022 is an NTN N single-row cylindrical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 28 mm width (4.331 × 6.693 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 146 kN, C0 174 kN, Pu 19.2 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2300 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1022 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1022 is supplied in the standard open execution shown in the table." }, { "q": "Can N1022 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1022?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 125 mm, Ew 155 mm. The nominal bore/OD remain 110/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1022", "N1022" ], "locale_variants": {} }, { "sku": "NJ1022", "brand": "NTN", "manufacturer_designation": "NTN NJ1022", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 174, "fatigue_load_limit_kN": 19.2, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ1022 denotes a 110×170×28 mm (4.331 × 6.693 × 1.102 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1022 floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. The 30.0 mm radial section ((170−110)/2) frames the roller complement; capacity per millimetre of bore is about 1.3 kN/mm before application factors. Equivalent-load planning treats NJ1022 as a pure radial bearing: keep P below 146 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1022.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "The 30.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "Open NJ1022 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "If the shaft must be located both ways, do not use NJ1022 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 30.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "The 146/174 kN ratings, 19.2 kN Pu and 2300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1022 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1022?", "a": "NJ1022 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 28 mm width (4.331 × 6.693 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 146 kN, C0 174 kN, Pu 19.2 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2300 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1022 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1022 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1022 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1022?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 125 mm, Ew 155 mm. The nominal bore/OD remain 110/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1022", "NJ1022" ], "locale_variants": {} }, { "sku": "NN3022", "brand": "NTN", "manufacturer_designation": "NTN NN3022", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 254, "static_load_kN": 375, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3022 appears as a 110 mm bore single-row cylindrical roller bearing (254 kN C / 375 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN3022 to its envelope: type code NN, series NN3000, 110 mm bore; the 170×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 254 kN and C0 375 kN (C0/C ≈ 1.48) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 3,600 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 4,300 r/min for continuously high-duty 110 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3022 non-locating position preloads the bearing when the shaft grows.", "applications": [ "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Open NN3022 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "Grease limiting speed 3,600 r/min and oil 4,300 r/min are different limits for NN3022: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 170 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3022 skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The 254/375 kN ratings, 41.5 kN Pu and 3690 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3022 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3022?", "a": "NN3022 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 254 kN, C0 375 kN, Pu 41.5 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3690 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3022 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3022 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3022?", "a": "NN3022 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3022?", "a": "NTN rates NN3022 at 3,600 r/min with grease and 4,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3022", "NN3022" ], "locale_variants": {} }, { "sku": "NN3022K", "brand": "NTN", "manufacturer_designation": "NTN NN3022K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 254, "static_load_kN": 375, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3022K is the standard section of the NTN NN3000 dimension series for a 110 mm shaft — 254 kN of basic dynamic capacity in a 3560 g, open bearing. Digit by digit, NN3022K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 254 kN and C0 375 kN (C0/C ≈ 1.48) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. The 2.3 kN-per-mm-bore figure (254 kN over 110 mm) lets a NN3022K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3022K non-locating position preloads the bearing when the shaft grows.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "Wide (22/23) and light (10/49) executions at 110 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Do not replace NN3022K with a deep-groove ball bearing on rating alone: line contact gives 254 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3022K skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The 254/375 kN ratings, 41.5 kN Pu and 3560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3022K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3022K?", "a": "NN3022K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 254 kN, C0 375 kN, Pu 41.5 kN, grease limiting speed 3,600 r/min, oil 4,300 r/min, mass about 3560 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3022K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3022K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3022K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3022K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3022 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3022K?", "a": "NTN rates NN3022K at 3,600 r/min with grease and 4,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3022K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=158", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3022k", "NN3022K" ], "locale_variants": {} }, { "sku": "NU1022", "brand": "NTN", "manufacturer_designation": "NTN NU1022", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 174, "fatigue_load_limit_kN": 19.2, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1022 appears as a 110 mm bore single-row cylindrical roller bearing (146 kN C / 174 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NU1022 to its envelope: type code NU, series NU1000, 110 mm bore; the 170×28 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 4,800 r/min with oil versus 4,100 r/min with grease (a 700 r/min band), lubrication choice for NU1022 is a thermal decision, not just a sealing one. Rating life at 146 kN C assumes clean oil and adequate film; the 19.2 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1022 non-locating position preloads the bearing when the shaft grows.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NU1022 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 30.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 28 mm-wide cavity.", "If the shaft must be located both ways, do not use NU1022 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NU1022: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 146/174 kN ratings, 19.2 kN Pu and 2300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1022 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1022?", "a": "NU1022 is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 28 mm width (4.331 × 6.693 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 146 kN, C0 174 kN, Pu 19.2 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2300 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1022 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1022 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1022 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1022?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 125 mm, Ew 155 mm. The nominal bore/OD remain 110/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1022-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1022", "NU1022" ], "locale_variants": {} }, { "sku": "NUP1022", "brand": "NTN", "manufacturer_designation": "NTN NUP1022", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 174, "fatigue_load_limit_kN": 19.2, "limiting_speed_rpm": 4100, "max_rpm": 4100, "speed_oil_rpm": 4800, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1022 appears as a 110 mm bore single-row cylindrical roller bearing (146 kN C / 174 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP1022 to its envelope: type code NUP, series NUP1000, 110 mm bore; the 170×28 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 146 kN and C0 174 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Speed ratio check: limiting 4,100 r/min is .85 of the 4,800 r/min oil value for NUP1022; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 110 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 170 mm raceway.", "If the shaft must be located both ways, do not use NUP1022 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NUP1022 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "Grease limiting speed 4,100 r/min and oil 4,800 r/min are different limits for NUP1022: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1022 skids at 4,100 r/min and fails by smearing long before L10 fatigue.", "The 146/174 kN ratings, 19.2 kN Pu and 2300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1022 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1022?", "a": "NUP1022 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 28 mm width (4.331 × 6.693 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 146 kN, C0 174 kN, Pu 19.2 kN, grease limiting speed 4,100 r/min, oil 4,800 r/min, mass about 2300 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1022 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1022 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1022 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1022?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 125 mm, Ew 155 mm. The nominal bore/OD remain 110/170 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 4,100 r/min grease / 4,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1022", "NUP1022" ], "locale_variants": {} }, { "sku": "N222", "brand": "NTN", "manufacturer_designation": "NTN N222", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 290, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 4540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N222 appears as a 110 mm bore single-row cylindrical roller bearing (266 kN C / 290 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 110 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 132.5 mm and Ew 178.5 mm — the envelope inside the 110/200 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 31 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (290/266 kN) shows the high-static-capacity proportioning of this 110 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N222.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for N222: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 38 mm-wide cavity.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 38 mm-wide cavity.", "The N rib arrangement is not interchangeable with another prefix on the same 110 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 200×38 mm envelope matches.", "The 266/290 kN ratings, 31 kN Pu and 4540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N222?", "a": "N222 is an NTN N single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 290 kN, Pu 31 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 4540 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N222 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N222 is supplied in the standard open execution shown in the table." }, { "q": "Can N222 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N222-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n222", "N222" ], "locale_variants": {} }, { "sku": "N2222", "brand": "NTN", "manufacturer_designation": "NTN N2222", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 415, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 6430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N2222 on the 110×200 mm envelope, 53 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,100 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 200 mm OD and 53 mm width from the ISO 15 general plan. The 53 mm width and 45.0 mm section put the N2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 6430 g for the 110×200×53 mm N2222 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2222.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Wide (22/23) and light (10/49) executions at 110 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The N rib arrangement is not interchangeable with another prefix on the same 110 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 200×53 mm envelope matches.", "Grease limiting speed 3,100 r/min and oil 3,700 r/min are different limits for N2222: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open N2222 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The 350/415 kN ratings, 44 kN Pu and 6430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2222?", "a": "N2222 is an NTN N single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 415 kN, Pu 44 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 6430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2222 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2222 is supplied in the standard open execution shown in the table." }, { "q": "Can N2222 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2222", "N2222" ], "locale_variants": {} }, { "sku": "NF222", "brand": "NTN", "manufacturer_designation": "NTN NF222", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 290, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 4540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 110 mm shaft NTN supplies NF222: one integral rib on each ring; the open execution is rated 3,400 r/min on grease and 4,000 r/min on oil. Numbering ties NF222 to its envelope: type code NF, series NF200, 110 mm bore; the 200×38 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 4,000 r/min with oil versus 3,400 r/min with grease (a 600 r/min band), lubrication choice for NF222 is a thermal decision, not just a sealing one. The 2.4 kN-per-mm-bore figure (266 kN over 110 mm) lets a NF222 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 110 mm shaft.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The NF rib arrangement is not interchangeable with another prefix on the same 110 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 200×38 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "Do not replace NF222 with a deep-groove ball bearing on rating alone: line contact gives 266 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for NF222: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 266/290 kN ratings, 31 kN Pu and 4540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF222?", "a": "NF222 is an NTN NF single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 290 kN, Pu 31 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 4540 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF222 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF222 is supplied in the standard open execution shown in the table." }, { "q": "Can NF222 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf222", "NF222" ], "locale_variants": {} }, { "sku": "NJ222", "brand": "NTN", "manufacturer_designation": "NTN NJ222", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 290, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 4540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ222 is the standard section of the NTN NJ200 dimension series for a 110 mm shaft — 266 kN of basic dynamic capacity in a 4540 g, open bearing. Numbering ties NJ222 to its envelope: type code NJ, series NJ200, 110 mm bore; the 200×38 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 132.5 mm and Ew 178.5 mm — the envelope inside the 110/200 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 31 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (290/266 kN) shows the high-static-capacity proportioning of this 110 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 38 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ222 skids at 3,400 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The NJ rib arrangement is not interchangeable with another prefix on the same 110 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 200×38 mm envelope matches.", "The 266/290 kN ratings, 31 kN Pu and 4540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ222?", "a": "NJ222 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 290 kN, Pu 31 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 4540 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ222 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ222 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ222 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ222-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj222", "NJ222" ], "locale_variants": {} }, { "sku": "NJ2222", "brand": "NTN", "manufacturer_designation": "NTN NJ2222", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 415, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 6430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2222 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 110×200×53 mm ISO 15 envelope. Numbering ties NJ2222 to its envelope: type code NJ, series NJ2200, 110 mm bore; the 200×53 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 132.5 mm and Ew 178.5 mm — the envelope inside the 110/200 mm bore/OD where the rollers actually run. The 110 mm (4.331 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 53 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "If the shaft must be located both ways, do not use NJ2222 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 3,100 r/min and oil 3,700 r/min are different limits for NJ2222: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NJ2222 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 110 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 200×53 mm envelope matches.", "The 350/415 kN ratings, 44 kN Pu and 6430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2222?", "a": "NJ2222 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 415 kN, Pu 44 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 6430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2222 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2222 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2222 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2222-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×53 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2222", "NJ2222" ], "locale_variants": {} }, { "sku": "NJ2222E", "brand": "NTN", "manufacturer_designation": "NTN NJ2222E", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 425, "static_load_kN": 515, "fatigue_load_limit_kN": 55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2222E is the wide (22) section of the NTN NJ2200 dimension series for a 110 mm shaft — 425 kN of basic dynamic capacity in a open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2222E floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 2,800 r/min grease and 3,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 110 mm bore. The 3.9 kN-per-mm-bore figure (425 kN over 110 mm) lets a NJ2222E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NJ2222E; an oversized radius locks the ring on its face and tilts the 53 mm-wide seat.", "applications": [ "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 53 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "If the shaft must be located both ways, do not use NJ2222E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2222E skids at 2,800 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NJ2222E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 425/515 kN ratings, 55 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2222E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2222E?", "a": "NJ2222E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 425 kN, C0 515 kN, Pu 55 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2222E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2222E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2222E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2222E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2222E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2222e", "NJ2222E" ], "locale_variants": {} }, { "sku": "NJ222E", "brand": "NTN", "manufacturer_designation": "NTN NJ222E", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 365, "fatigue_load_limit_kN": 39, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ222E denotes a 110×200×38 mm (4.331 × 7.874 × 1.496 in) cylindrical roller bearing in the NJ200 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ222E floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NJ222E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 3,100 r/min is .84 of the 3,700 r/min oil value for NJ222E; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ222E; an oversized radius locks the ring on its face and tilts the 38 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 325/365 kN pair here belongs to NJ222E as printed, not to the bare size.", "The 38 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Do not replace NJ222E with a deep-groove ball bearing on rating alone: line contact gives 325 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 325/365 kN ratings, 39 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ222E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ222E?", "a": "NJ222E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 365 kN, Pu 39 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ222E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ222E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ222E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ222E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ222E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj222e", "NJ222E" ], "locale_variants": {} }, { "sku": "NU222", "brand": "NTN", "manufacturer_designation": "NTN NU222", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 290, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 4540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU222 on the 110×200 mm envelope, 38 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. Digit by digit, NU222 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,400 r/min grease and 4,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 110 mm bore. Thermal planning around the 3,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,000 r/min for continuously high-duty 110 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 38 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU222 skids at 3,400 r/min and fails by smearing long before L10 fatigue.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 38 mm-wide cavity.", "If the shaft must be located both ways, do not use NU222 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 266/290 kN ratings, 31 kN Pu and 4540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU222?", "a": "NU222 is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 290 kN, Pu 31 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 4540 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU222 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU222 is supplied in the standard open execution shown in the table." }, { "q": "Can NU222 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU222-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu222", "NU222" ], "locale_variants": {} }, { "sku": "NU2222", "brand": "NTN", "manufacturer_designation": "NTN NU2222", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 415, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 6430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2222 is the wide (22) section of the NTN NU2200 dimension series for a 110 mm shaft — 350 kN of basic dynamic capacity in a 6430 g, open bearing. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2222 floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NU2222 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NU2222 as a pure radial bearing: keep P below 350 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU2222; an oversized radius locks the ring on its face and tilts the 53 mm-wide seat.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The NU rib arrangement is not interchangeable with another prefix on the same 110 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 200×53 mm envelope matches.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 53 mm-wide cavity.", "Do not replace NU2222 with a deep-groove ball bearing on rating alone: line contact gives 350 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 350/415 kN ratings, 44 kN Pu and 6430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2222?", "a": "NU2222 is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 415 kN, Pu 44 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 6430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2222 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2222 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2222 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2222-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×53 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2222", "NU2222" ], "locale_variants": {} }, { "sku": "NU2222E", "brand": "NTN", "manufacturer_designation": "NTN NU2222E", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 425, "static_load_kN": 515, "fatigue_load_limit_kN": 55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2222E on the 110×200 mm envelope, 53 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,800 r/min. Numbering ties NU2222E to its envelope: type code NU, series NU2200, 110 mm bore; the 200×53 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Equivalent-load planning treats NU2222E as a pure radial bearing: keep P below 425 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU2222E; an oversized radius locks the ring on its face and tilts the 53 mm-wide seat.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "Open NU2222E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "Open NU2222E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 425/515 kN pair here belongs to NU2222E as printed, not to the bare size.", "The 425/515 kN ratings, 55 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2222E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2222E?", "a": "NU2222E is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 425 kN, C0 515 kN, Pu 55 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2222E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2222E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2222E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2222E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2222E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2222e", "NU2222E" ], "locale_variants": {} }, { "sku": "NU222E", "brand": "NTN", "manufacturer_designation": "NTN NU222E", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 365, "fatigue_load_limit_kN": 39, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU222E appears as a 110 mm bore single-row cylindrical roller bearing (325 kN C / 365 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Digit by digit, NU222E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU222E.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU222E skids at 3,100 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU222E skids at 3,100 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 110 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 325/365 kN pair here belongs to NU222E as printed, not to the bare size.", "The 325/365 kN ratings, 39 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU222E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU222E?", "a": "NU222E is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 365 kN, Pu 39 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU222E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU222E is supplied in the standard open execution shown in the table." }, { "q": "Can NU222E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU222E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU222E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu222e", "NU222E" ], "locale_variants": {} }, { "sku": "NUP222", "brand": "NTN", "manufacturer_designation": "NTN NUP222", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 266, "static_load_kN": 290, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 4540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP222 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 266 kN dynamic rating in the 110 mm bore. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 200 mm OD and 38 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP222. The 2.4 kN-per-mm-bore figure (266 kN over 110 mm) lets a NUP222 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP222 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "The 38 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 38 mm-wide cavity.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for NUP222: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The 266/290 kN ratings, 31 kN Pu and 4540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP222?", "a": "NUP222 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 290 kN, Pu 31 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 4540 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP222 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP222 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP222 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP222-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup222", "NUP222" ], "locale_variants": {} }, { "sku": "NUP2222", "brand": "NTN", "manufacturer_designation": "NTN NUP2222", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 415, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_g": 6430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2222 denotes a 110×200×53 mm (4.331 × 7.874 × 2.087 in) cylindrical roller bearing in the NUP2200 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2222 floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. With C 350 kN and C0 415 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 3.2 kN-per-mm-bore figure (350 kN over 110 mm) lets a NUP2222 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP2222; an oversized radius locks the ring on its face and tilts the 53 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NUP2222 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 53 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2222 skids at 3,100 r/min and fails by smearing long before L10 fatigue.", "The 350/415 kN ratings, 44 kN Pu and 6430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2222 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2222?", "a": "NUP2222 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 350 kN, C0 415 kN, Pu 44 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min, mass about 6430 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2222 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2222 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2222 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2222?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm, Ew 178.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2222-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×53 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2222", "NUP2222" ], "locale_variants": {} }, { "sku": "NUP2222E", "brand": "NTN", "manufacturer_designation": "NTN NUP2222E", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 425, "static_load_kN": 515, "fatigue_load_limit_kN": 55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2222E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 110×200×53 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 200 mm OD and 53 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,800 r/min grease and 3,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 110 mm bore. Thermal planning around the 2,800 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 3,300 r/min for continuously high-duty 110 mm positions. Housing and shaft fillets must clear the ring chamfers of NUP2222E; an oversized radius locks the ring on its face and tilts the 53 mm-wide seat.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Grease limiting speed 2,800 r/min and oil 3,300 r/min are different limits for NUP2222E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2222E skids at 2,800 r/min and fails by smearing long before L10 fatigue.", "The 45.0 mm section at 110 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 53 mm-wide cavity.", "If the shaft must be located both ways, do not use NUP2222E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 425/515 kN ratings, 55 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2222E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2222E?", "a": "NUP2222E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 425 kN, C0 515 kN, Pu 55 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2222E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2222E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2222E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2222E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2222E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2222e", "NUP2222E" ], "locale_variants": {} }, { "sku": "NUP222E", "brand": "NTN", "manufacturer_designation": "NTN NUP222E", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 365, "fatigue_load_limit_kN": 39, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP222E is the standard section of the NTN NUP200 dimension series for a 110 mm shaft — 325 kN of basic dynamic capacity in a open bearing. Digit by digit, NUP222E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,100 r/min grease and 3,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 110 mm bore. Selection arithmetic: Pu 39 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.12 (365/325 kN) shows the high-static-capacity proportioning of this 110 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP222E.", "applications": [ "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 200 mm raceway.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP222E skids at 3,100 r/min and fails by smearing long before L10 fatigue.", "The 38 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NUP222E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 325/365 kN ratings, 39 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP222E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP222E?", "a": "NUP222E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 38 mm width (4.331 × 7.874 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 325 kN, C0 365 kN, Pu 39 kN, grease limiting speed 3,100 r/min, oil 3,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP222E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP222E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP222E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP222E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 132.5 mm. The nominal bore/OD remain 110/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,100 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP222E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup222e", "NUP222E" ], "locale_variants": {} }, { "sku": "N2322", "brand": "NTN", "manufacturer_designation": "NTN N2322", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 670, "static_load_kN": 790, "fatigue_load_limit_kN": 81.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 16800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 110 mm shaft NTN supplies N2322: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,600 r/min on grease and 3,100 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N2322 floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N2322. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2322.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "Do not replace N2322 with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open N2322 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.", "The 670/790 kN ratings, 81.5 kN Pu and 16800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2322?", "a": "N2322 is an NTN N single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 790 kN, Pu 81.5 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 16800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2322 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2322 is supplied in the standard open execution shown in the table." }, { "q": "Can N2322 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2322", "N2322" ], "locale_variants": {} }, { "sku": "N322", "brand": "NTN", "manufacturer_designation": "NTN N322", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 400, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N322 is the standard section of the NTN N300 dimension series for a 110 mm shaft — 395 kN of basic dynamic capacity in a 9770 g, open bearing. Digit by digit, N322 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,500 r/min with oil versus 3,000 r/min with grease (a 500 r/min band), lubrication choice for N322 is a thermal decision, not just a sealing one. Mass 9770 g for the 110×240×50 mm N322 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "The 65.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 50 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.", "Do not replace N322 with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for N322: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 395/400 kN ratings, 41.5 kN Pu and 9770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N322?", "a": "N322 is an NTN N single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 400 kN, Pu 41.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N322 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N322 is supplied in the standard open execution shown in the table." }, { "q": "Can N322 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N322-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n322", "N322" ], "locale_variants": {} }, { "sku": "NF322", "brand": "NTN", "manufacturer_designation": "NTN NF322", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 400, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF322 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 395 kN dynamic rating in the 110 mm bore. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 240 mm OD and 50 mm width from the ISO 15 general plan. The 65.0 mm radial section ((240−110)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Heat the inner ring to max 120 °C for the 110 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for NF322: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 110 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.", "The 65.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 50 mm-wide cavity.", "The 395/400 kN ratings, 41.5 kN Pu and 9770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF322?", "a": "NF322 is an NTN NF single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 400 kN, Pu 41.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF322 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF322 is supplied in the standard open execution shown in the table." }, { "q": "Can NF322 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf322", "NF322" ], "locale_variants": {} }, { "sku": "NJ2322", "brand": "NTN", "manufacturer_designation": "NTN NJ2322", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 670, "static_load_kN": 790, "fatigue_load_limit_kN": 81.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 16800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2322 on the 110×240 mm envelope, 80 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,600 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 240 mm OD and 80 mm width from the ISO 15 general plan. At 3,100 r/min with oil versus 2,600 r/min with grease (a 500 r/min band), lubrication choice for NJ2322 is a thermal decision, not just a sealing one. Rating life at 670 kN C assumes clean oil and adequate film; the 81.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2322 non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NJ2322 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 110 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 240×80 mm envelope matches.", "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NJ2322: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 670/790 kN ratings, 81.5 kN Pu and 16800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2322?", "a": "NJ2322 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 790 kN, Pu 81.5 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 16800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2322 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2322 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2322 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2322-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2322", "NJ2322" ], "locale_variants": {} }, { "sku": "NJ2322E", "brand": "NTN", "manufacturer_designation": "NTN NJ2322E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 750, "static_load_kN": 880, "fatigue_load_limit_kN": 90.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2322E appears as a 110 mm bore single-row cylindrical roller bearing (750 kN C / 880 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 240 mm OD and 80 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NJ2322E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 2,400 r/min is .86 of the 2,800 r/min oil value for NJ2322E; grease-churn heating closes that gap as fill quantity rises. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 110 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "Wide (22/23) and light (10/49) executions at 110 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 750/880 kN pair here belongs to NJ2322E as printed, not to the bare size.", "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Do not replace NJ2322E with a deep-groove ball bearing on rating alone: line contact gives 750 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 750/880 kN ratings, 90.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2322E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2322E?", "a": "NJ2322E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 750 kN, C0 880 kN, Pu 90.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2322E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2322E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2322E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2322E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2322E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2322e", "NJ2322E" ], "locale_variants": {} }, { "sku": "NJ322", "brand": "NTN", "manufacturer_designation": "NTN NJ322", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 400, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ322 denotes a 110×240×50 mm (4.331 × 9.449 × 1.969 in) cylindrical roller bearing in the NJ300 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ322 floats or locates; the numeric remainder is the ISO 15 series and 110 mm bore reference, not a fit or clearance instruction. The 65.0 mm radial section ((240−110)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. Speed ratio check: limiting 3,000 r/min is .86 of the 3,500 r/min oil value for NJ322; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "If the shaft must be located both ways, do not use NJ322 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NJ322 with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NJ322 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The 65.0 mm section at 110 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 50 mm-wide cavity.", "The 395/400 kN ratings, 41.5 kN Pu and 9770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ322?", "a": "NJ322 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 400 kN, Pu 41.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ322 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ322 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ322 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ322-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj322", "NJ322" ], "locale_variants": {} }, { "sku": "NJ322E", "brand": "NTN", "manufacturer_designation": "NTN NJ322E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 525, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 11400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ322E is the standard section of the NTN NJ300 dimension series for a 110 mm shaft — 500 kN of basic dynamic capacity in a 11400 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 240 mm OD and 50 mm width from the ISO 15 general plan. The 50 mm width and 65.0 mm section put the NJ300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 110 mm (4.331 in) bore and 240 mm (9.449 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 50 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 110 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "Open NJ322E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Open NJ322E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "Open NJ322E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The 500/525 kN ratings, 54 kN Pu and 11400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ322E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ322E?", "a": "NJ322E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 525 kN, Pu 54 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 11400 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ322E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ322E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ322E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ322E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ322E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj322e", "NJ322E" ], "locale_variants": {} }, { "sku": "NU2322", "brand": "NTN", "manufacturer_designation": "NTN NU2322", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 670, "static_load_kN": 790, "fatigue_load_limit_kN": 81.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 16800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2322 denotes a 110×240×80 mm (4.331 × 9.449 × 3.15 in) cylindrical roller bearing in the NU2300 family, a pressed sheet-steel cage. Digit by digit, NU2322 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 143 mm and Ew 207 mm — the envelope inside the 110/240 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 81.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.18 (790/670 kN) shows the high-static-capacity proportioning of this 110 mm bore. Housing and shaft fillets must clear the ring chamfers of NU2322; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.", "applications": [ "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/790 kN pair here belongs to NU2322 as printed, not to the bare size.", "Open NU2322 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The NU rib arrangement is not interchangeable with another prefix on the same 110 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 240×80 mm envelope matches.", "The NU rib arrangement is not interchangeable with another prefix on the same 110 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 240×80 mm envelope matches.", "The 670/790 kN ratings, 81.5 kN Pu and 16800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2322?", "a": "NU2322 is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 790 kN, Pu 81.5 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 16800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2322 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2322 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2322 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2322-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2322", "NU2322" ], "locale_variants": {} }, { "sku": "NU2322E", "brand": "NTN", "manufacturer_designation": "NTN NU2322E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 750, "static_load_kN": 880, "fatigue_load_limit_kN": 90.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2322E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 110×240×80 mm ISO 15 envelope. Digit by digit, NU2322E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,800 r/min with oil versus 2,400 r/min with grease (a 400 r/min band), lubrication choice for NU2322E is a thermal decision, not just a sealing one. Rating life at 750 kN C assumes clean oil and adequate film; the 90.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 110 mm shaft.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "Open NU2322E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2322E skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 750/880 kN pair here belongs to NU2322E as printed, not to the bare size.", "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NU2322E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 750/880 kN ratings, 90.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2322E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2322E?", "a": "NU2322E is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 750 kN, C0 880 kN, Pu 90.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2322E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2322E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2322E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2322E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2322E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2322e", "NU2322E" ], "locale_variants": {} }, { "sku": "NU322", "brand": "NTN", "manufacturer_designation": "NTN NU322", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 400, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 110 mm shaft NTN supplies NU322: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,000 r/min on grease and 3,500 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 110 mm, with 240 mm OD and 50 mm width from the ISO 15 general plan. With C 395 kN and C0 400 kN (C0/C ≈ 1.01) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "If the shaft must be located both ways, do not use NU322 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NU322 with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NU rib arrangement is not interchangeable with another prefix on the same 110 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 240×50 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU322 skids at 3,000 r/min and fails by smearing long before L10 fatigue.", "The 395/400 kN ratings, 41.5 kN Pu and 9770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU322?", "a": "NU322 is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 400 kN, Pu 41.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU322 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU322 is supplied in the standard open execution shown in the table." }, { "q": "Can NU322 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU322-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu322", "NU322" ], "locale_variants": {} }, { "sku": "NU322E", "brand": "NTN", "manufacturer_designation": "NTN NU322E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 525, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 11400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU322E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 500 kN dynamic rating in the 110 mm bore. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 110 mm (00–03 use the 10/12/15/17 exception table). The 65.0 mm radial section ((240−110)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. The 110 mm (4.331 in) bore and 240 mm (9.449 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 50 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU322E.", "applications": [ "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "If the shaft must be located both ways, do not use NU322E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NU322E with a deep-groove ball bearing on rating alone: line contact gives 500 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NU322E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 110 mm contact.", "The 65.0 mm section at 110 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 50 mm-wide cavity.", "The 500/525 kN ratings, 54 kN Pu and 11400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU322E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU322E?", "a": "NU322E is an NTN NU single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 525 kN, Pu 54 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 11400 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU322E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU322E is supplied in the standard open execution shown in the table." }, { "q": "Can NU322E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU322E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU322E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu322e", "NU322E" ], "locale_variants": {} }, { "sku": "NUP2322", "brand": "NTN", "manufacturer_designation": "NTN NUP2322", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 670, "static_load_kN": 790, "fatigue_load_limit_kN": 81.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 16800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2322 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 110×240×80 mm ISO 15 envelope. Digit by digit, NUP2322 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NUP2322 as a pure radial bearing: keep P below 670 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 110 mm shaft.", "applications": [ "crusher and vibrating-screen drive shafts", "marine gearbox and deck-machinery shafts", "large electric-motor and generator rotors", "cement and mining conveyor drive pulleys" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/790 kN pair here belongs to NUP2322 as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/790 kN pair here belongs to NUP2322 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2322 skids at 2,600 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/790 kN pair here belongs to NUP2322 as printed, not to the bare size.", "The 670/790 kN ratings, 81.5 kN Pu and 16800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2322?", "a": "NUP2322 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 790 kN, Pu 81.5 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 16800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2322 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2322 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2322 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2322-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2322", "NUP2322" ], "locale_variants": {} }, { "sku": "NUP2322E", "brand": "NTN", "manufacturer_designation": "NTN NUP2322E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 750, "static_load_kN": 880, "fatigue_load_limit_kN": 90.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2322E denotes a 110×240×80 mm (4.331 × 9.449 × 3.15 in) cylindrical roller bearing in the NUP2300 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NUP2322E to its envelope: type code NUP, series NUP2300, 110 mm bore; the 240×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP2322E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass Dimensions 110×240×80 mm and the 750 kN C rating define the substitution envelope; check the 2203E mass column for this exact NUP2322E execution. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 110 mm shaft.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "Do not replace NUP2322E with a deep-groove ball bearing on rating alone: line contact gives 750 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2322E skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "Do not replace NUP2322E with a deep-groove ball bearing on rating alone: line contact gives 750 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 750/880 kN ratings, 90.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2322E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2322E?", "a": "NUP2322E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 750 kN, C0 880 kN, Pu 90.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2322E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2322E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2322E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2322E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2322E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2322e", "NUP2322E" ], "locale_variants": {} }, { "sku": "NUP322", "brand": "NTN", "manufacturer_designation": "NTN NUP322", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 400, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 9770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP322 appears as a 110 mm bore single-row cylindrical roller bearing (395 kN C / 400 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 110 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 110 mm (4.331 in) bore and 240 mm (9.449 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 50 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP322 non-locating position preloads the bearing when the shaft grows.", "applications": [ "cement and mining conveyor drive pulleys", "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for NUP322: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.", "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 110 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 395/400 kN pair here belongs to NUP322 as printed, not to the bare size.", "The 395/400 kN ratings, 41.5 kN Pu and 9770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP322 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP322?", "a": "NUP322 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 400 kN, Pu 41.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9770 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP322 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP322 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP322 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP322?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP322-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup322", "NUP322" ], "locale_variants": {} }, { "sku": "NUP322E", "brand": "NTN", "manufacturer_designation": "NTN NUP322E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 525, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 11400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP322E appears as a 110 mm bore single-row cylindrical roller bearing (500 kN C / 525 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 110 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NUP322E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 4.5 kN-per-mm-bore figure (500 kN over 110 mm) lets a NUP322E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy industrial gearbox and reducer shafts", "large pump, turbine and compressor rotors", "rolling-mill auxiliary drive shafts", "crusher and vibrating-screen drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.", "If the shaft must be located both ways, do not use NUP322E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 65.0 mm section at 110 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 50 mm-wide cavity.", "Do not replace NUP322E with a deep-groove ball bearing on rating alone: line contact gives 500 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NUP322E with a deep-groove ball bearing on rating alone: line contact gives 500 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 500/525 kN ratings, 54 kN Pu and 11400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP322E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP322E?", "a": "NUP322E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 525 kN, Pu 54 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 11400 g. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP322E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP322E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP322E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP322E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP322E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup322e", "NUP322E" ], "locale_variants": {} }, { "sku": "NN4924", "brand": "NTN", "manufacturer_designation": "NTN NN4924", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 360, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4200, "weight_g": 2630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN4924 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 120×165×45 mm ISO 15 envelope. Numbering ties NN4924 to its envelope: type code NN, series NN4900, 120 mm bore; the 165×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 134.5 mm — the envelope inside the 120/165 mm bore/OD where the rollers actually run. Equivalent-load planning treats NN4924 as a pure radial bearing: keep P below 203 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN4924.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 4,200 r/min need positive flow and drain design; the 2630 g NN4924 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 3,600 r/min and oil 4,200 r/min are different limits for NN4924: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NN rib arrangement is not interchangeable with another prefix on the same 120 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 165×45 mm envelope matches.", "The 203/360 kN ratings, 39.5 kN Pu and 2630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4924 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4924?", "a": "NN4924 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 120 mm bore, 165 mm OD and 45 mm width (4.724 × 6.496 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 360 kN, Pu 39.5 kN, grease limiting speed 3,600 r/min, oil 4,200 r/min, mass about 2630 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4924 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4924 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4924?", "a": "NN4924 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN4924?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 134.5 mm. The nominal bore/OD remain 120/165 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4924", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4924", "NN4924" ], "locale_variants": {} }, { "sku": "NN4924K", "brand": "NTN", "manufacturer_designation": "NTN NN4924K", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 360, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4200, "weight_g": 2510, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN4924K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 203 kN dynamic rating in the 120 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4924K floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. With C 203 kN and C0 360 kN (C0/C ≈ 1.77) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 3,600 r/min is .86 of the 4,200 r/min oil value for NN4924K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NN4924K; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 4,200 r/min need positive flow and drain design; the 2510 g NN4924K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 22.5 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4924K skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4924K skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4924K skids at 3,600 r/min and fails by smearing long before L10 fatigue.", "The 203/360 kN ratings, 39.5 kN Pu and 2510 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4924K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4924K?", "a": "NN4924K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 120 mm bore, 165 mm OD and 45 mm width (4.724 × 6.496 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 360 kN, Pu 39.5 kN, grease limiting speed 3,600 r/min, oil 4,200 r/min, mass about 2510 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4924K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4924K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4924K?", "a": "The K suffix denotes a 1:12 tapered bore. NN4924K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4924 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN4924K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 134.5 mm. The nominal bore/OD remain 120/165 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4924K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4924k", "NN4924K" ], "locale_variants": {} }, { "sku": "NNU4924K", "brand": "NTN", "manufacturer_designation": "NTN NNU4924K", "series": "NNU4900-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 203, "static_load_kN": 360, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "speed_oil_rpm": 4200, "weight_g": 2630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNU4924K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 120×165×45 mm ISO 15 envelope. Digit by digit, NNU4924K reads as NNU (double row, ribbed outer ring, separable inner), ISO 15 series, and bore 120 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NNU4924K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NNU4924K as a pure radial bearing: keep P below 203 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.", "applications": [ "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 4,200 r/min need positive flow and drain design; the 2630 g NNU4924K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NNU4924K with a deep-groove ball bearing on rating alone: line contact gives 203 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 203/360 kN pair here belongs to NNU4924K as printed, not to the bare size.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "Do not replace NNU4924K with a deep-groove ball bearing on rating alone: line contact gives 203 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 203/360 kN ratings, 39.5 kN Pu and 2630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4924K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNU4924K?", "a": "NNU4924K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 120 mm bore, 165 mm OD and 45 mm width (4.724 × 6.496 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 203 kN, C0 360 kN, Pu 39.5 kN, grease limiting speed 3,600 r/min, oil 4,200 r/min, mass about 2630 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4924K is the NNU execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4924K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4924K?", "a": "The K suffix denotes a 1:12 tapered bore. NNU4924K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4924 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NNU4924K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 134.5 mm. The nominal bore/OD remain 120/165 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,600 r/min grease / 4,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NNU4924K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nnu4924k", "NNU4924K" ], "locale_variants": {} }, { "sku": "N1024", "brand": "NTN", "manufacturer_designation": "NTN N1024", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 191, "fatigue_load_limit_kN": 20.6, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4400, "weight_g": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N1024 on the 120×180 mm envelope, 28 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,800 r/min. Digit by digit, N1024 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 120 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 135 mm and Ew 165 mm — the envelope inside the 120/180 mm bore/OD where the rollers actually run. The 120 mm (4.724 in) bore and 180 mm (7.087 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 28 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N1024 non-locating position preloads the bearing when the shaft grows.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 4,400 r/min need positive flow and drain design; the 2400 g N1024 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace N1024 with a deep-groove ball bearing on rating alone: line contact gives 154 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace N1024 with a deep-groove ball bearing on rating alone: line contact gives 154 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The N rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 180×28 mm envelope matches.", "The 154/191 kN ratings, 20.6 kN Pu and 2400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1024 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1024?", "a": "N1024 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 28 mm width (4.724 × 7.087 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 191 kN, Pu 20.6 kN, grease limiting speed 3,800 r/min, oil 4,400 r/min, mass about 2400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1024 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1024 is supplied in the standard open execution shown in the table." }, { "q": "Can N1024 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1024?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 165 mm. The nominal bore/OD remain 120/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1024", "N1024" ], "locale_variants": {} }, { "sku": "NJ1024", "brand": "NTN", "manufacturer_designation": "NTN NJ1024", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 191, "fatigue_load_limit_kN": 20.6, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4400, "weight_g": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1024 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 120×180×28 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 2400 g for the 120×180×28 mm NJ1024 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NJ1024; an oversized radius locks the ring on its face and tilts the 28 mm-wide seat.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 4,400 r/min need positive flow and drain design; the 2400 g NJ1024 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The NJ rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 180×28 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 154/191 kN pair here belongs to NJ1024 as printed, not to the bare size.", "The 154/191 kN ratings, 20.6 kN Pu and 2400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1024 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1024?", "a": "NJ1024 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 28 mm width (4.724 × 7.087 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 191 kN, Pu 20.6 kN, grease limiting speed 3,800 r/min, oil 4,400 r/min, mass about 2400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1024 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1024 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1024 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1024?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 165 mm. The nominal bore/OD remain 120/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1024", "NJ1024" ], "locale_variants": {} }, { "sku": "NN3024", "brand": "NTN", "manufacturer_designation": "NTN NN3024", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 258, "static_load_kN": 390, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 3980, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3024 is the standard section of the NTN NN3000 dimension series for a 120 mm shaft — 258 kN of basic dynamic capacity in a 3980 g, open bearing. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 180 mm OD and 46 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 30.0 mm radial section between the 120 mm bore and 180 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Speed ratio check: limiting 3,300 r/min is .85 of the 3,900 r/min oil value for NN3024; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3980 g NN3024 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3024 skids at 3,300 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 3,300 r/min and oil 3,900 r/min are different limits for NN3024: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NN rib arrangement is not interchangeable with another prefix on the same 120 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 180×46 mm envelope matches.", "The 258/390 kN ratings, 42.5 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3024 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3024?", "a": "NN3024 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 258 kN, C0 390 kN, Pu 42.5 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3980 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3024 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3024 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3024?", "a": "NN3024 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3024?", "a": "NTN rates NN3024 at 3,300 r/min with grease and 3,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3024", "NN3024" ], "locale_variants": {} }, { "sku": "NN3024K", "brand": "NTN", "manufacturer_designation": "NTN NN3024K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 258, "static_load_kN": 390, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 3830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NN3024K on the 120×180 mm envelope, 46 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 3,300 r/min. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 180 mm OD and 46 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3024K. Speed ratio check: limiting 3,300 r/min is .85 of the 3,900 r/min oil value for NN3024K; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3830 g NN3024K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NN3024K with a deep-groove ball bearing on rating alone: line contact gives 258 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 258/390 kN pair here belongs to NN3024K as printed, not to the bare size.", "The 30.0 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 258/390 kN ratings, 42.5 kN Pu and 3830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3024K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3024K?", "a": "NN3024K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 258 kN, C0 390 kN, Pu 42.5 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3830 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3024K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3024K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3024K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3024K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3024 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3024K?", "a": "NTN rates NN3024K at 3,300 r/min with grease and 3,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3024K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3024k", "NN3024K" ], "locale_variants": {} }, { "sku": "NU1024", "brand": "NTN", "manufacturer_designation": "NTN NU1024", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 191, "fatigue_load_limit_kN": 20.6, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4400, "weight_g": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1024 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 120 mm shaft — 154 kN of basic dynamic capacity in a 2400 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 180 mm OD and 28 mm width from the ISO 15 general plan. With C 154 kN and C0 191 kN (C0/C ≈ 1.24) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 4,400 r/min need positive flow and drain design; the 2400 g NU1024 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 154/191 kN pair here belongs to NU1024 as printed, not to the bare size.", "Do not replace NU1024 with a deep-groove ball bearing on rating alone: line contact gives 154 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 180×28 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1024 skids at 3,800 r/min and fails by smearing long before L10 fatigue.", "The 154/191 kN ratings, 20.6 kN Pu and 2400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1024 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1024?", "a": "NU1024 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 28 mm width (4.724 × 7.087 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 191 kN, Pu 20.6 kN, grease limiting speed 3,800 r/min, oil 4,400 r/min, mass about 2400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1024 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1024 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1024 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1024?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 165 mm. The nominal bore/OD remain 120/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1024-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1024", "NU1024" ], "locale_variants": {} }, { "sku": "NUP1024", "brand": "NTN", "manufacturer_designation": "NTN NUP1024", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 154, "static_load_kN": 191, "fatigue_load_limit_kN": 20.6, "limiting_speed_rpm": 3800, "max_rpm": 3800, "speed_oil_rpm": 4400, "weight_g": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1024 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 120 mm shaft — 154 kN of basic dynamic capacity in a 2400 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 180 mm OD and 28 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 135 mm and Ew 165 mm — the envelope inside the 120/180 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 20.6 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.24 (191/154 kN) shows the high-static-capacity proportioning of this 120 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 4,400 r/min need positive flow and drain design; the 2400 g NUP1024 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 154/191 kN pair here belongs to NUP1024 as printed, not to the bare size.", "The 28 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.", "The NUP rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 180×28 mm envelope matches.", "The 154/191 kN ratings, 20.6 kN Pu and 2400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1024 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1024?", "a": "NUP1024 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 28 mm width (4.724 × 7.087 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 154 kN, C0 191 kN, Pu 20.6 kN, grease limiting speed 3,800 r/min, oil 4,400 r/min, mass about 2400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1024 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1024 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1024 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1024?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 135 mm, Ew 165 mm. The nominal bore/OD remain 120/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,800 r/min grease / 4,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1024", "NUP1024" ], "locale_variants": {} }, { "sku": "N2224", "brand": "NTN", "manufacturer_designation": "NTN N2224", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 385, "static_load_kN": 460, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 8030, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies N2224: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,900 r/min on grease and 3,400 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N2224 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2224 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 120 mm (4.724 in) bore and 215 mm (8.465 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of N2224; an oversized radius locks the ring on its face and tilts the 58 mm-wide seat.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 8030 g N2224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The N rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 385/460 kN pair here belongs to N2224 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 385/460 kN ratings, 48 kN Pu and 8030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2224?", "a": "N2224 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 385 kN, C0 460 kN, Pu 48 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 8030 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2224 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2224 is supplied in the standard open execution shown in the table." }, { "q": "Can N2224 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2224", "N2224" ], "locale_variants": {} }, { "sku": "N224", "brand": "NTN", "manufacturer_designation": "NTN N224", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 288, "static_load_kN": 320, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 5460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N224 is the standard section of the NTN N200 dimension series for a 120 mm shaft — 288 kN of basic dynamic capacity in a 5460 g, open bearing. Digit by digit, N224 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 120 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N224. Equivalent-load planning treats N224 as a pure radial bearing: keep P below 288 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of N224; an oversized radius locks the ring on its face and tilts the 40 mm-wide seat.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,700 r/min need positive flow and drain design; the 5460 g N224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use N224 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace N224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace N224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "The 288/320 kN ratings, 33.5 kN Pu and 5460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N224?", "a": "N224 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 288 kN, C0 320 kN, Pu 33.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 5460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N224 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N224 is supplied in the standard open execution shown in the table." }, { "q": "Can N224 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N224-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n224", "N224" ], "locale_variants": {} }, { "sku": "NF224", "brand": "NTN", "manufacturer_designation": "NTN NF224", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 288, "static_load_kN": 320, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 5460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF224 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 288 kN dynamic rating in the 120 mm bore. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 215 mm OD and 40 mm width from the ISO 15 general plan. With C 288 kN and C0 320 kN (C0/C ≈ 1.11) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Rating life at 288 kN C assumes clean oil and adequate film; the 33.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF224 non-locating position preloads the bearing when the shaft grows.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,700 r/min need positive flow and drain design; the 5460 g NF224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NF224 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "Grease limiting speed 3,200 r/min and oil 3,700 r/min are different limits for NF224: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF224 skids at 3,200 r/min and fails by smearing long before L10 fatigue.", "The 288/320 kN ratings, 33.5 kN Pu and 5460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF224?", "a": "NF224 is an NTN NF single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 288 kN, C0 320 kN, Pu 33.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 5460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF224 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF224 is supplied in the standard open execution shown in the table." }, { "q": "Can NF224 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf224", "NF224" ], "locale_variants": {} }, { "sku": "NJ2224", "brand": "NTN", "manufacturer_designation": "NTN NJ2224", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 385, "static_load_kN": 460, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 8030, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2224 on the 120×215 mm envelope, 58 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,900 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 215 mm OD and 58 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2224. The 3.2 kN-per-mm-bore figure (385 kN over 120 mm) lets a NJ2224 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 120 mm shaft.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 8030 g NJ2224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 385/460 kN pair here belongs to NJ2224 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The NJ rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "The 385/460 kN ratings, 48 kN Pu and 8030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2224?", "a": "NJ2224 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 385 kN, C0 460 kN, Pu 48 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 8030 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2224 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2224 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2224 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2224-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2224", "NJ2224" ], "locale_variants": {} }, { "sku": "NJ2224E", "brand": "NTN", "manufacturer_designation": "NTN NJ2224E", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 620, "fatigue_load_limit_kN": 64.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ2224E on the 120×215 mm envelope, 58 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,600 r/min. Digit by digit, NJ2224E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 120 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 58 mm width and 47.5 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 2,600 r/min is .87 of the 3,000 r/min oil value for NJ2224E; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2224E.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the NJ2224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NJ rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.", "Grease limiting speed 2,600 r/min and oil 3,000 r/min are different limits for NJ2224E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "Open NJ2224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "The 500/620 kN ratings, 64.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2224E?", "a": "NJ2224E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 620 kN, Pu 64.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2224E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2224E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2224E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2224E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2224E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2224e", "NJ2224E" ], "locale_variants": {} }, { "sku": "NJ224", "brand": "NTN", "manufacturer_designation": "NTN NJ224", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 288, "static_load_kN": 320, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 5460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ224 denotes a 120×215×40 mm (4.724 × 8.465 × 1.575 in) cylindrical roller bearing in the NJ200 family, a pressed sheet-steel cage. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 215 mm OD and 40 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ224. Equivalent-load planning treats NJ224 as a pure radial bearing: keep P below 288 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 120 mm shaft.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,700 r/min need positive flow and drain design; the 5460 g NJ224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "The 47.5 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "Grease limiting speed 3,200 r/min and oil 3,700 r/min are different limits for NJ224: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "The 288/320 kN ratings, 33.5 kN Pu and 5460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ224?", "a": "NJ224 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 288 kN, C0 320 kN, Pu 33.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 5460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ224 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ224 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ224 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ224-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj224", "NJ224" ], "locale_variants": {} }, { "sku": "NJ224E", "brand": "NTN", "manufacturer_designation": "NTN NJ224E", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 420, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies NJ224E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,900 r/min on grease and 3,400 r/min on oil. Digit by digit, NJ224E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 120 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NJ224E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 120 mm (4.724 in) bore and 215 mm (8.465 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 40 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ224E.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the NJ224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ224E skids at 2,900 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NJ224E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NJ224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 370/420 kN ratings, 44 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ224E?", "a": "NJ224E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 420 kN, Pu 44 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ224E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ224E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ224E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ224E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ224E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj224e", "NJ224E" ], "locale_variants": {} }, { "sku": "NU2224", "brand": "NTN", "manufacturer_designation": "NTN NU2224", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 385, "static_load_kN": 460, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 8030, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2224 denotes a 120×215×58 mm (4.724 × 8.465 × 2.283 in) cylindrical roller bearing in the NU2200 family, a pressed sheet-steel cage. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The 58 mm width and 47.5 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 8030 g for the 120×215×58 mm NU2224 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 8030 g NU2224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 385/460 kN pair here belongs to NU2224 as printed, not to the bare size.", "Do not replace NU2224 with a deep-groove ball bearing on rating alone: line contact gives 385 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NU2224 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "The 385/460 kN ratings, 48 kN Pu and 8030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2224?", "a": "NU2224 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 385 kN, C0 460 kN, Pu 48 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 8030 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2224 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2224 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2224 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2224-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2224", "NU2224" ], "locale_variants": {} }, { "sku": "NU2224E", "brand": "NTN", "manufacturer_designation": "NTN NU2224E", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 620, "fatigue_load_limit_kN": 64.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2224E appears as a 120 mm bore single-row cylindrical roller bearing (500 kN C / 620 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2224E floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. With C 500 kN and C0 620 kN (C0/C ≈ 1.24) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Rating life at 500 kN C assumes clean oil and adequate film; the 64.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2224E.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the NU2224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2224E skids at 2,600 r/min and fails by smearing long before L10 fatigue.", "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/620 kN pair here belongs to NU2224E as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2224E skids at 2,600 r/min and fails by smearing long before L10 fatigue.", "The 500/620 kN ratings, 64.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2224E?", "a": "NU2224E is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 620 kN, Pu 64.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2224E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2224E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2224E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2224E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2224E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2224e", "NU2224E" ], "locale_variants": {} }, { "sku": "NU224", "brand": "NTN", "manufacturer_designation": "NTN NU224", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 288, "static_load_kN": 320, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 5460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies NU224: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,200 r/min on grease and 3,700 r/min on oil. Numbering ties NU224 to its envelope: type code NU, series NU200, 120 mm bore; the 215×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU224 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 3,200 r/min is .86 of the 3,700 r/min oil value for NU224; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,700 r/min need positive flow and drain design; the 5460 g NU224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.", "The 47.5 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "Do not replace NU224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace NU224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 288/320 kN ratings, 33.5 kN Pu and 5460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU224?", "a": "NU224 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 288 kN, C0 320 kN, Pu 33.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 5460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU224 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU224 is supplied in the standard open execution shown in the table." }, { "q": "Can NU224 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU224-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu224", "NU224" ], "locale_variants": {} }, { "sku": "NU224E", "brand": "NTN", "manufacturer_designation": "NTN NU224E", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 420, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU224E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 120×215×40 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 215 mm OD and 40 mm width from the ISO 15 general plan. With C 370 kN and C0 420 kN (C0/C ≈ 1.14) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Equivalent-load planning treats NU224E as a pure radial bearing: keep P below 370 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the NU224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/420 kN pair here belongs to NU224E as printed, not to the bare size.", "Open NU224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "Grease limiting speed 2,900 r/min and oil 3,400 r/min are different limits for NU224E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU224E skids at 2,900 r/min and fails by smearing long before L10 fatigue.", "The 370/420 kN ratings, 44 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU224E?", "a": "NU224E is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 420 kN, Pu 44 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU224E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU224E is supplied in the standard open execution shown in the table." }, { "q": "Can NU224E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU224E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU224E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu224e", "NU224E" ], "locale_variants": {} }, { "sku": "NUP2224", "brand": "NTN", "manufacturer_designation": "NTN NUP2224", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 385, "static_load_kN": 460, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 8030, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2224 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 120×215×58 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 143.5 mm and Ew 191.5 mm — the envelope inside the 120/215 mm bore/OD where the rollers actually run. Rating life at 385 kN C assumes clean oil and adequate film; the 48 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 8030 g NUP2224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The NUP rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2224 skids at 2,900 r/min and fails by smearing long before L10 fatigue.", "The NUP rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.", "The 385/460 kN ratings, 48 kN Pu and 8030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2224?", "a": "NUP2224 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 385 kN, C0 460 kN, Pu 48 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 8030 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2224 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2224 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2224 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2224-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2224", "NUP2224" ], "locale_variants": {} }, { "sku": "NUP2224E", "brand": "NTN", "manufacturer_designation": "NTN NUP2224E", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 620, "fatigue_load_limit_kN": 64.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2224E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 500 kN dynamic rating in the 120 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The 58 mm width and 47.5 mm section put the NUP2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass Dimensions 120×215×58 mm and the 500 kN C rating define the substitution envelope; check the 2203E mass column for this exact NUP2224E execution. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2224E.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the NUP2224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 47.5 mm section at 120 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.", "Open NUP2224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2224E skids at 2,600 r/min and fails by smearing long before L10 fatigue.", "Open NUP2224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "The 500/620 kN ratings, 64.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2224E?", "a": "NUP2224E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 620 kN, Pu 64.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2224E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2224E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2224E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2224E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2224E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2224e", "NUP2224E" ], "locale_variants": {} }, { "sku": "NUP224", "brand": "NTN", "manufacturer_designation": "NTN NUP224", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 288, "static_load_kN": 320, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3700, "weight_g": 5460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP224 appears as a 120 mm bore single-row cylindrical roller bearing (288 kN C / 320 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP224 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP224 designation when purchasing. Rating life at 288 kN C assumes clean oil and adequate film; the 33.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,700 r/min need positive flow and drain design; the 5460 g NUP224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 47.5 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "Do not replace NUP224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The 288/320 kN ratings, 33.5 kN Pu and 5460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP224?", "a": "NUP224 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 288 kN, C0 320 kN, Pu 33.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 5460 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP224 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP224 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP224 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP224?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP224-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup224", "NUP224" ], "locale_variants": {} }, { "sku": "NUP224E", "brand": "NTN", "manufacturer_designation": "NTN NUP224E", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 420, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP224E on the 120×215 mm envelope, 40 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,900 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 215 mm OD and 40 mm width from the ISO 15 general plan. The 40 mm width and 47.5 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 3.1 kN-per-mm-bore figure (370 kN over 120 mm) lets a NUP224E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the NUP224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/420 kN pair here belongs to NUP224E as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/420 kN pair here belongs to NUP224E as printed, not to the bare size.", "Do not replace NUP224E with a deep-groove ball bearing on rating alone: line contact gives 370 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Open NUP224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "The 370/420 kN ratings, 44 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP224E?", "a": "NUP224E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 420 kN, Pu 44 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP224E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP224E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP224E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP224E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP224E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup224e", "NUP224E" ], "locale_variants": {} }, { "sku": "N2324", "brand": "NTN", "manufacturer_designation": "NTN N2324", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 785, "static_load_kN": 920, "fatigue_load_limit_kN": 92.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 21100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2324 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 785 kN dynamic rating in the 120 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2324 designation when purchasing. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,800 r/min for continuously high-duty 120 mm positions. Housing and shaft fillets must clear the ring chamfers of N2324; an oversized radius locks the ring on its face and tilts the 86 mm-wide seat.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g N2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for N2324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2324 skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2324?", "a": "N2324 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2324 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2324 is supplied in the standard open execution shown in the table." }, { "q": "Can N2324 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2324", "N2324" ], "locale_variants": {} }, { "sku": "N324", "brand": "NTN", "manufacturer_designation": "NTN N324", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 510, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N324 denotes a 120×260×55 mm (4.724 × 10.236 × 2.165 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. Numbering ties N324 to its envelope: type code N, series N300, 120 mm bore; the 260×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 500 kN and C0 510 kN (C0/C ≈ 1.02) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 120 mm (4.724 in) bore and 260 mm (10.236 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 55 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g N324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.", "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for N324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N324 skids at 2,700 r/min and fails by smearing long before L10 fatigue.", "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N324?", "a": "N324 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N324 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N324 is supplied in the standard open execution shown in the table." }, { "q": "Can N324 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N324-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n324", "N324" ], "locale_variants": {} }, { "sku": "NF324", "brand": "NTN", "manufacturer_designation": "NTN NF324", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 510, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF324 appears as a 120 mm bore single-row cylindrical roller bearing (500 kN C / 510 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF324 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,200 r/min for continuously high-duty 120 mm positions. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NF324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NF324 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NF324 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for NF324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NF324 as printed, not to the bare size.", "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF324?", "a": "NF324 is an NTN NF single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF324 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF324 is supplied in the standard open execution shown in the table." }, { "q": "Can NF324 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf324", "NF324" ], "locale_variants": {} }, { "sku": "NJ2324", "brand": "NTN", "manufacturer_designation": "NTN NJ2324", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 785, "static_load_kN": 920, "fatigue_load_limit_kN": 92.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 21100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies NJ2324: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,400 r/min on grease and 2,800 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2324 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. With C 785 kN and C0 920 kN (C0/C ≈ 1.17) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g NJ2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The NJ rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 785/920 kN pair here belongs to NJ2324 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2324 skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2324?", "a": "NJ2324 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2324 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2324 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2324 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2324-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2324", "NJ2324" ], "locale_variants": {} }, { "sku": "NJ2324E", "brand": "NTN", "manufacturer_designation": "NTN NJ2324E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1030, "fatigue_load_limit_kN": 103, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2324E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 120×260×86 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NJ2324E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 120 mm (4.724 in) bore and 260 mm (10.236 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 86 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NJ2324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NJ2324E with a deep-groove ball bearing on rating alone: line contact gives 880 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NJ2324E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NJ2324E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 880/1030 kN ratings, 103 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2324E?", "a": "NJ2324E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 880 kN, C0 1030 kN, Pu 103 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2324E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2324E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2324E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2324E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2324E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2324e", "NJ2324E" ], "locale_variants": {} }, { "sku": "NJ324", "brand": "NTN", "manufacturer_designation": "NTN NJ324", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 510, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ324 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 120×260×55 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 51 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.02 (510/500 kN) shows the high-static-capacity proportioning of this 120 mm bore. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 120 mm shaft.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NJ324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NJ324 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.", "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NJ324 as printed, not to the bare size.", "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ324?", "a": "NJ324 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ324 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ324 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ324 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ324-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj324", "NJ324" ], "locale_variants": {} }, { "sku": "NJ324E", "brand": "NTN", "manufacturer_designation": "NTN NJ324E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 585, "static_load_kN": 610, "fatigue_load_limit_kN": 61, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ324E on the 120×260 mm envelope, 55 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,400 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The 70.0 mm radial section ((260−120)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,800 r/min for continuously high-duty 120 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NJ324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NJ324E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/610 kN pair here belongs to NJ324E as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/610 kN pair here belongs to NJ324E as printed, not to the bare size.", "The 70.0 mm section at 120 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.", "The 585/610 kN ratings, 61 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ324E?", "a": "NJ324E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 610 kN, Pu 61 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ324E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ324E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ324E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ324E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ324E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj324e", "NJ324E" ], "locale_variants": {} }, { "sku": "NU2324", "brand": "NTN", "manufacturer_designation": "NTN NU2324", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 785, "static_load_kN": 920, "fatigue_load_limit_kN": 92.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 21100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2324 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 120×260×86 mm ISO 15 envelope. Numbering ties NU2324 to its envelope: type code NU, series NU2300, 120 mm bore; the 260×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2324. Equivalent-load planning treats NU2324 as a pure radial bearing: keep P below 785 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g NU2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 785/920 kN pair here belongs to NU2324 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.", "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2324?", "a": "NU2324 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2324 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2324 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2324 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2324-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2324", "NU2324" ], "locale_variants": {} }, { "sku": "NU2324E", "brand": "NTN", "manufacturer_designation": "NTN NU2324E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1030, "fatigue_load_limit_kN": 103, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2324E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 880 kN dynamic rating in the 120 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 260 mm OD and 86 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 154 mm — the envelope inside the 120/260 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 103 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.17 (1030/880 kN) shows the high-static-capacity proportioning of this 120 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NU2324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NU2324E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Open NU2324E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.", "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.", "The 880/1030 kN ratings, 103 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2324E?", "a": "NU2324E is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 880 kN, C0 1030 kN, Pu 103 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2324E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2324E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2324E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2324E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2324E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2324e", "NU2324E" ], "locale_variants": {} }, { "sku": "NU324", "brand": "NTN", "manufacturer_designation": "NTN NU324", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 510, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU324 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 500 kN dynamic rating in the 120 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU324 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 154 mm and Ew 226 mm — the envelope inside the 120/260 mm bore/OD where the rollers actually run. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,200 r/min for continuously high-duty 120 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NU324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NU324 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NU324 as printed, not to the bare size.", "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×55 mm envelope matches.", "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU324?", "a": "NU324 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU324 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU324 is supplied in the standard open execution shown in the table." }, { "q": "Can NU324 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU324-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu324", "NU324" ], "locale_variants": {} }, { "sku": "NU324E", "brand": "NTN", "manufacturer_designation": "NTN NU324E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 585, "static_load_kN": 610, "fatigue_load_limit_kN": 61, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU324E denotes a 120×260×55 mm (4.724 × 10.236 × 2.165 in) cylindrical roller bearing in the NU300 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NU324E to its envelope: type code NU, series NU300, 120 mm bore; the 260×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,800 r/min with oil versus 2,400 r/min with grease (a 400 r/min band), lubrication choice for NU324E is a thermal decision, not just a sealing one. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,800 r/min for continuously high-duty 120 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NU324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU324E skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/610 kN pair here belongs to NU324E as printed, not to the bare size.", "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NU324E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 585/610 kN ratings, 61 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU324E?", "a": "NU324E is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 610 kN, Pu 61 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU324E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU324E is supplied in the standard open execution shown in the table." }, { "q": "Can NU324E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU324E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU324E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu324e", "NU324E" ], "locale_variants": {} }, { "sku": "NUP2324", "brand": "NTN", "manufacturer_designation": "NTN NUP2324", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 785, "static_load_kN": 920, "fatigue_load_limit_kN": 92.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 21100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2324 on the 120×260 mm envelope, 86 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,400 r/min. Numbering ties NUP2324 to its envelope: type code NUP, series NUP2300, 120 mm bore; the 260×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,800 r/min with oil versus 2,400 r/min with grease (a 400 r/min band), lubrication choice for NUP2324 is a thermal decision, not just a sealing one. Mass 21100 g for the 120×260×86 mm NUP2324 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2324 non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g NUP2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "Open NUP2324 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.", "The 70.0 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.", "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NUP2324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2324?", "a": "NUP2324 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2324 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2324 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2324 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2324-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2324", "NUP2324" ], "locale_variants": {} }, { "sku": "NUP2324E", "brand": "NTN", "manufacturer_designation": "NTN NUP2324E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1030, "fatigue_load_limit_kN": 103, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies NUP2324E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,200 r/min on grease and 2,500 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2324E floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP2324E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NUP2324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NUP rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2324E skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 880/1030 kN ratings, 103 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2324E?", "a": "NUP2324E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 880 kN, C0 1030 kN, Pu 103 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2324E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2324E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2324E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2324E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2324E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2324e", "NUP2324E" ], "locale_variants": {} }, { "sku": "NUP324", "brand": "NTN", "manufacturer_designation": "NTN NUP324", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 500, "static_load_kN": 510, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3200, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP324 is the standard section of the NTN NUP300 dimension series for a 120 mm shaft — 500 kN of basic dynamic capacity in a 12500 g, open bearing. Digit by digit, NUP324 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 120 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,200 r/min with oil versus 2,700 r/min with grease (a 500 r/min band), lubrication choice for NUP324 is a thermal decision, not just a sealing one. The 4.2 kN-per-mm-bore figure (500 kN over 120 mm) lets a NUP324 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NUP324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NUP324 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for NUP324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP324 skids at 2,700 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for NUP324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP324?", "a": "NUP324 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP324 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP324 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP324 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP324?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP324-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup324", "NUP324" ], "locale_variants": {} }, { "sku": "NUP324E", "brand": "NTN", "manufacturer_designation": "NTN NUP324E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 585, "static_load_kN": 610, "fatigue_load_limit_kN": 61, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP324E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 120×260×55 mm ISO 15 envelope. Numbering ties NUP324E to its envelope: type code NUP, series NUP300, 120 mm bore; the 260×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NUP324E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 2,400 r/min is .86 of the 2,800 r/min oil value for NUP324E; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NUP324E; an oversized radius locks the ring on its face and tilts the 55 mm-wide seat.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NUP324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.", "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.", "The 70.0 mm section at 120 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 585/610 kN ratings, 61 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP324E?", "a": "NUP324E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 610 kN, Pu 61 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP324E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP324E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP324E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP324E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP324E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup324e", "NUP324E" ], "locale_variants": {} }, { "sku": "NN4926", "brand": "NTN", "manufacturer_designation": "NTN NN4926", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 244, "static_load_kN": 440, "fatigue_load_limit_kN": 47, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 3520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NN4926 on the 130×180 mm envelope, 50 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 3,300 r/min. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 180 mm OD and 50 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN4926. Mass 3520 g for the 130×180×50 mm NN4926 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NN4926; an oversized radius locks the ring on its face and tilts the 50 mm-wide seat.", "applications": [ "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3520 g NN4926 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NN rib arrangement is not interchangeable with another prefix on the same 130 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 180×50 mm envelope matches.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4926 does not substitute a precision-class execution.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 244/440 kN ratings, 47 kN Pu and 3520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4926 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4926?", "a": "NN4926 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 180 mm OD and 50 mm width (5.118 × 7.087 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 440 kN, Pu 47 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3520 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4926 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4926 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4926?", "a": "NN4926 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN4926?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 146 mm. The nominal bore/OD remain 130/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4926", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4926", "NN4926" ], "locale_variants": {} }, { "sku": "NN4926K", "brand": "NTN", "manufacturer_designation": "NTN NN4926K", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 244, "static_load_kN": 440, "fatigue_load_limit_kN": 47, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN4926K denotes a 130×180×50 mm (5.118 × 7.087 × 1.969 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN4926K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN4926K. The 130 mm (5.118 in) bore and 180 mm (7.087 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 50 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN4926K.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3350 g NN4926K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NN4926K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "Open NN4926K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.", "The 244/440 kN ratings, 47 kN Pu and 3350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4926K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4926K?", "a": "NN4926K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 180 mm OD and 50 mm width (5.118 × 7.087 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 440 kN, Pu 47 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3350 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4926K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4926K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4926K?", "a": "The K suffix denotes a 1:12 tapered bore. NN4926K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4926 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN4926K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 146 mm. The nominal bore/OD remain 130/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4926K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4926k", "NN4926K" ], "locale_variants": {} }, { "sku": "NNU4926K", "brand": "NTN", "manufacturer_designation": "NTN NNU4926K", "series": "NNU4900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 244, "static_load_kN": 440, "fatigue_load_limit_kN": 47, "limiting_speed_rpm": 3300, "max_rpm": 3300, "speed_oil_rpm": 3900, "weight_g": 3520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNU4926K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 244 kN dynamic rating in the 130 mm bore. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 180 mm OD and 50 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NNU4926K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 244 kN C assumes clean oil and adequate film; the 47 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3520 g NNU4926K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The K tapered bore of NNU4926K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "Open NNU4926K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.", "The 244/440 kN ratings, 47 kN Pu and 3520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4926K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNU4926K?", "a": "NNU4926K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 180 mm OD and 50 mm width (5.118 × 7.087 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 440 kN, Pu 47 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3520 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4926K is the NNU execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4926K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4926K?", "a": "The K suffix denotes a 1:12 tapered bore. NNU4926K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4926 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NNU4926K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 146 mm. The nominal bore/OD remain 130/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NNU4926K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nnu4926k", "NNU4926K" ], "locale_variants": {} }, { "sku": "N1026", "brand": "NTN", "manufacturer_designation": "NTN N1026", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 191, "static_load_kN": 238, "fatigue_load_limit_kN": 24.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies N1026: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 3,400 r/min on grease and 4,000 r/min on oil. Numbering ties N1026 to its envelope: type code N, series N1000, 130 mm bore; the 200×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N1026. The 1.5 kN-per-mm-bore figure (191 kN over 130 mm) lets a N1026 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g N1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for N1026: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1026 skids at 3,400 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1026?", "a": "N1026 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1026 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1026 is supplied in the standard open execution shown in the table." }, { "q": "Can N1026 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1026?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1026", "N1026" ], "locale_variants": {} }, { "sku": "NJ1026", "brand": "NTN", "manufacturer_designation": "NTN NJ1026", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 191, "static_load_kN": 238, "fatigue_load_limit_kN": 24.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ1026 on the 130×200 mm envelope, 33 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. Digit by digit, NJ1026 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,000 r/min with oil versus 3,400 r/min with grease (a 600 r/min band), lubrication choice for NJ1026 is a thermal decision, not just a sealing one. The 130 mm (5.118 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 33 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g NJ1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1026 skids at 3,400 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/238 kN pair here belongs to NJ1026 as printed, not to the bare size.", "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for NJ1026: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1026?", "a": "NJ1026 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1026 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1026 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1026 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1026?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1026-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1026", "NJ1026" ], "locale_variants": {} }, { "sku": "NN3026", "brand": "NTN", "manufacturer_designation": "NTN NN3026", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 475, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_g": 5920, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NN3026 denotes a 130×200×52 mm (5.118 × 7.874 × 2.047 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3026 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3026. Selection arithmetic: Pu 50 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.51 (475/315 kN) shows the high-static-capacity proportioning of this 130 mm bore. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 5920 g NN3026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NN3026 with a deep-groove ball bearing on rating alone: line contact gives 315 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3026 does not substitute a precision-class execution.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The 315/475 kN ratings, 50 kN Pu and 5920 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3026?", "a": "NN3026 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 475 kN, Pu 50 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min, mass about 5920 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3026 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3026 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3026?", "a": "NN3026 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3026?", "a": "NTN rates NN3026 at 3,100 r/min with grease and 3,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3026", "NN3026" ], "locale_variants": {} }, { "sku": "NN3026K", "brand": "NTN", "manufacturer_designation": "NTN NN3026K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 475, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 3100, "max_rpm": 3100, "speed_oil_rpm": 3600, "weight_g": 5710, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3026K appears as a 130 mm bore single-row cylindrical roller bearing (315 kN C / 475 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 3,100 r/min grease and 3,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 130 mm bore. The 130 mm (5.118 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 52 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 5710 g NN3026K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The K tapered bore of NN3026K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3026K skids at 3,100 r/min and fails by smearing long before L10 fatigue.", "The K tapered bore of NN3026K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "The 315/475 kN ratings, 50 kN Pu and 5710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3026K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3026K?", "a": "NN3026K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 475 kN, Pu 50 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min, mass about 5710 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3026K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3026K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3026K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3026K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3026 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3026K?", "a": "NTN rates NN3026K at 3,100 r/min with grease and 3,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3026K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3026k", "NN3026K" ], "locale_variants": {} }, { "sku": "NU1026", "brand": "NTN", "manufacturer_designation": "NTN NU1026", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 191, "static_load_kN": 238, "fatigue_load_limit_kN": 24.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU1026 denotes a 130×200×33 mm (5.118 × 7.874 × 1.299 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1026 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 148 mm and Ew 182 mm — the envelope inside the 130/200 mm bore/OD where the rollers actually run. Thermal planning around the 3,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,000 r/min for continuously high-duty 130 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g NU1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/238 kN pair here belongs to NU1026 as printed, not to the bare size.", "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 200×33 mm envelope matches.", "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1026?", "a": "NU1026 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1026 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1026 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1026 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1026?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1026-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1026", "NU1026" ], "locale_variants": {} }, { "sku": "NUP1026", "brand": "NTN", "manufacturer_designation": "NTN NUP1026", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 191, "static_load_kN": 238, "fatigue_load_limit_kN": 24.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP1026 denotes a 130×200×33 mm (5.118 × 7.874 × 1.299 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1026 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP1026. Equivalent-load planning treats NUP1026 as a pure radial bearing: keep P below 191 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1026.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g NUP1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1026 skids at 3,400 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NUP1026 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.", "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1026?", "a": "NUP1026 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1026 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1026 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1026 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1026?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1026", "NUP1026" ], "locale_variants": {} }, { "sku": "N2226", "brand": "NTN", "manufacturer_designation": "NTN N2226", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 420, "static_load_kN": 530, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2226 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 420 kN dynamic rating in the 130 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 3.2 kN/mm before application factors. The 3.2 kN-per-mm-bore figure (420 kN over 130 mm) lets a N2226 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g N2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open N2226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "Open N2226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "If the shaft must be located both ways, do not use N2226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.", "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2226?", "a": "N2226 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2226 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2226 is supplied in the standard open execution shown in the table." }, { "q": "Can N2226 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2226", "N2226" ], "locale_variants": {} }, { "sku": "N226", "brand": "NTN", "manufacturer_designation": "NTN N226", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 300, "static_load_kN": 340, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 6170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N226 denotes a 130×230×40 mm (5.118 × 9.055 × 1.575 in) cylindrical roller bearing in the N200 family, a pressed sheet-steel cage. Numbering ties N226 to its envelope: type code N, series N200, 130 mm bore; the 230×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N226 designation when purchasing. Mass 6170 g for the 130×230×40 mm N226 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g N226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 300/340 kN pair here belongs to N226 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N226?", "a": "N226 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N226 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N226 is supplied in the standard open execution shown in the table." }, { "q": "Can N226 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N226-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n226", "N226" ], "locale_variants": {} }, { "sku": "NF226", "brand": "NTN", "manufacturer_designation": "NTN NF226", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 300, "static_load_kN": 340, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 6170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF226 appears as a 130 mm bore single-row cylindrical roller bearing (300 kN C / 340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF226 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 156 mm and Ew 204 mm — the envelope inside the 130/230 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NF226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF226 skids at 2,900 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 2,900 r/min and oil 3,400 r/min are different limits for NF226: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NF rib arrangement is not interchangeable with another prefix on the same 130 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 230×40 mm envelope matches.", "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF226?", "a": "NF226 is an NTN NF single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF226 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF226 is supplied in the standard open execution shown in the table." }, { "q": "Can NF226 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf226", "NF226" ], "locale_variants": {} }, { "sku": "NJ2226", "brand": "NTN", "manufacturer_designation": "NTN NJ2226", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 420, "static_load_kN": 530, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies NJ2226: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,600 r/min on grease and 3,100 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2226 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ2226 designation when purchasing. Rating life at 420 kN C assumes clean oil and adequate film; the 54 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2226 non-locating position preloads the bearing when the shaft grows.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g NJ2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "If the shaft must be located both ways, do not use NJ2226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 420/530 kN pair here belongs to NJ2226 as printed, not to the bare size.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2226?", "a": "NJ2226 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2226 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2226 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2226 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2226-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2226", "NJ2226" ], "locale_variants": {} }, { "sku": "NJ2226E", "brand": "NTN", "manufacturer_designation": "NTN NJ2226E", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 590, "static_load_kN": 735, "fatigue_load_limit_kN": 75, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2226E appears as a 130 mm bore single-row cylindrical roller bearing (590 kN C / 735 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 230 mm OD and 64 mm width from the ISO 15 general plan. The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. The 130 mm (5.118 in) bore and 230 mm (9.055 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 64 mm-wide ring. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the NJ2226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NJ2226E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Do not replace NJ2226E with a deep-groove ball bearing on rating alone: line contact gives 590 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Open NJ2226E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.", "The 590/735 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2226E?", "a": "NJ2226E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 590 kN, C0 735 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2226E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2226E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2226E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2226E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2226E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2226e", "NJ2226E" ], "locale_variants": {} }, { "sku": "NJ226", "brand": "NTN", "manufacturer_designation": "NTN NJ226", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 300, "static_load_kN": 340, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 6170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ226 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 130×230×40 mm ISO 15 envelope. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ226 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ226 designation when purchasing. Mass 6170 g for the 130×230×40 mm NJ226 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ226 non-locating position preloads the bearing when the shaft grows.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NJ226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NJ226 with a deep-groove ball bearing on rating alone: line contact gives 300 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ226?", "a": "NJ226 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ226 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ226 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ226 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ226-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj226", "NJ226" ], "locale_variants": {} }, { "sku": "NJ226E", "brand": "NTN", "manufacturer_designation": "NTN NJ226E", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 405, "static_load_kN": 455, "fatigue_load_limit_kN": 46, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ226E is the standard section of the NTN NJ200 dimension series for a 130 mm shaft — 405 kN of basic dynamic capacity in a open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 230 mm OD and 40 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 2,600 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 3,100 r/min for continuously high-duty 130 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the NJ226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 405/455 kN pair here belongs to NJ226E as printed, not to the bare size.", "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NJ226E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 405/455 kN pair here belongs to NJ226E as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 405/455 kN pair here belongs to NJ226E as printed, not to the bare size.", "The 405/455 kN ratings, 46 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ226E?", "a": "NJ226E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 405 kN, C0 455 kN, Pu 46 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ226E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ226E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ226E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ226E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ226E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj226e", "NJ226E" ], "locale_variants": {} }, { "sku": "NU2226", "brand": "NTN", "manufacturer_designation": "NTN NU2226", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 420, "static_load_kN": 530, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2226 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 130×230×64 mm ISO 15 envelope. Digit by digit, NU2226 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NU2226 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 130 mm (5.118 in) bore and 230 mm (9.055 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 64 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 130 mm shaft.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g NU2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.", "Open NU2226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2226?", "a": "NU2226 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2226 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2226 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2226 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2226-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2226", "NU2226" ], "locale_variants": {} }, { "sku": "NU2226E", "brand": "NTN", "manufacturer_designation": "NTN NU2226E", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 590, "static_load_kN": 735, "fatigue_load_limit_kN": 75, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2226E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 130×230×64 mm ISO 15 envelope. Digit by digit, NU2226E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2226E. Selection arithmetic: Pu 75 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (735/590 kN) shows the high-static-capacity proportioning of this 130 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the NU2226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 590/735 kN pair here belongs to NU2226E as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "The 590/735 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2226E?", "a": "NU2226E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 590 kN, C0 735 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2226E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2226E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2226E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2226E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2226E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2226e", "NU2226E" ], "locale_variants": {} }, { "sku": "NU226", "brand": "NTN", "manufacturer_designation": "NTN NU226", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 300, "static_load_kN": 340, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 6170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU226 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 300 kN dynamic rating in the 130 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 230 mm OD and 40 mm width from the ISO 15 general plan. The 40 mm width and 50.0 mm section put the NU200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 35 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.13 (340/300 kN) shows the high-static-capacity proportioning of this 130 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU226 non-locating position preloads the bearing when the shaft grows.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NU226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NU226 with a deep-groove ball bearing on rating alone: line contact gives 300 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "Open NU226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU226?", "a": "NU226 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU226 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU226 is supplied in the standard open execution shown in the table." }, { "q": "Can NU226 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU226-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu226", "NU226" ], "locale_variants": {} }, { "sku": "NU226E", "brand": "NTN", "manufacturer_designation": "NTN NU226E", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 405, "static_load_kN": 455, "fatigue_load_limit_kN": 46, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU226E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 405 kN dynamic rating in the 130 mm bore. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU226E. Rating life at 405 kN C assumes clean oil and adequate film; the 46 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the NU226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 230×40 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "The 405/455 kN ratings, 46 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU226E?", "a": "NU226E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 405 kN, C0 455 kN, Pu 46 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU226E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU226E is supplied in the standard open execution shown in the table." }, { "q": "Can NU226E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU226E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU226E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu226e", "NU226E" ], "locale_variants": {} }, { "sku": "NUP2226", "brand": "NTN", "manufacturer_designation": "NTN NUP2226", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 420, "static_load_kN": 530, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2226 on the 130×230 mm envelope, 64 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,600 r/min. Digit by digit, NUP2226 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2226. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 130 mm shaft.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g NUP2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NUP rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 420/530 kN pair here belongs to NUP2226 as printed, not to the bare size.", "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2226?", "a": "NUP2226 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2226 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2226 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2226 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2226-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2226", "NUP2226" ], "locale_variants": {} }, { "sku": "NUP2226E", "brand": "NTN", "manufacturer_designation": "NTN NUP2226E", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 590, "static_load_kN": 735, "fatigue_load_limit_kN": 75, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP2226E denotes a 130×230×64 mm (5.118 × 9.055 × 2.52 in) cylindrical roller bearing in the NUP2200 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NUP2226E to its envelope: type code NUP, series NUP2200, 130 mm bore; the 230×64 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the NUP2226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NUP2226E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The NUP rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.", "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.", "The 590/735 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2226E?", "a": "NUP2226E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 590 kN, C0 735 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2226E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2226E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2226E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2226E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2226E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2226e", "NUP2226E" ], "locale_variants": {} }, { "sku": "NUP226", "brand": "NTN", "manufacturer_designation": "NTN NUP226", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 300, "static_load_kN": 340, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 2900, "max_rpm": 2900, "speed_oil_rpm": 3400, "weight_g": 6170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP226 is the standard section of the NTN NUP200 dimension series for a 130 mm shaft — 300 kN of basic dynamic capacity in a 6170 g, open bearing. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,900 r/min grease and 3,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 130 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NUP226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NUP226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NUP226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP226?", "a": "NUP226 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP226 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP226 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP226 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP226?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP226-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup226", "NUP226" ], "locale_variants": {} }, { "sku": "NUP226E", "brand": "NTN", "manufacturer_designation": "NTN NUP226E", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 405, "static_load_kN": 455, "fatigue_load_limit_kN": 46, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP226E appears as a 130 mm bore single-row cylindrical roller bearing (405 kN C / 455 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 3.1 kN/mm before application factors. Speed ratio check: limiting 2,600 r/min is .84 of the 3,100 r/min oil value for NUP226E; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the NUP226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NUP226E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.", "The 405/455 kN ratings, 46 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP226E?", "a": "NUP226E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 405 kN, C0 455 kN, Pu 46 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP226E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP226E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP226E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP226E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP226E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup226e", "NUP226E" ], "locale_variants": {} }, { "sku": "N2326", "brand": "NTN", "manufacturer_designation": "NTN N2326", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1130, "fatigue_load_limit_kN": 111, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 26400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2326 appears as a 130 mm bore single-row cylindrical roller bearing (930 kN C / 1130 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N2326 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,200 r/min grease and 2,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 130 mm bore. Speed ratio check: limiting 2,200 r/min is .85 of the 2,600 r/min oil value for N2326; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g N2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use N2326 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2326 skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 93 mm-wide cavity.", "If the shaft must be located both ways, do not use N2326 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2326?", "a": "N2326 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2326 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2326 is supplied in the standard open execution shown in the table." }, { "q": "Can N2326 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2326", "N2326" ], "locale_variants": {} }, { "sku": "N326", "brand": "NTN", "manufacturer_designation": "NTN N326", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 665, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N326 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 130×280×58 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 280 mm OD and 58 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 167 mm and Ew 243 mm — the envelope inside the 130/280 mm bore/OD where the rollers actually run. The 4.8 kN-per-mm-bore figure (620 kN over 130 mm) lets a N326 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N326 non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g N326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for N326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The N rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.", "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N326?", "a": "N326 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N326 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N326 is supplied in the standard open execution shown in the table." }, { "q": "Can N326 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N326-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n326", "N326" ], "locale_variants": {} }, { "sku": "NF326", "brand": "NTN", "manufacturer_designation": "NTN NF326", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 665, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF326 is the standard section of the NTN NF300 dimension series for a 130 mm shaft — 620 kN of basic dynamic capacity in a 17000 g, open bearing. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). At 2,900 r/min with oil versus 2,500 r/min with grease (a 400 r/min band), lubrication choice for NF326 is a thermal decision, not just a sealing one. Speed ratio check: limiting 2,500 r/min is .86 of the 2,900 r/min oil value for NF326; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF326.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NF326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 620/665 kN pair here belongs to NF326 as printed, not to the bare size.", "The NF rib arrangement is not interchangeable with another prefix on the same 130 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NF326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF326?", "a": "NF326 is an NTN NF single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF326 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF326 is supplied in the standard open execution shown in the table." }, { "q": "Can NF326 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf326", "NF326" ], "locale_variants": {} }, { "sku": "NJ2326", "brand": "NTN", "manufacturer_designation": "NTN NJ2326", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1130, "fatigue_load_limit_kN": 111, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 26400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2326 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 930 kN dynamic rating in the 130 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 167 mm and Ew 243 mm — the envelope inside the 130/280 mm bore/OD where the rollers actually run. Thermal planning around the 2,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,600 r/min for continuously high-duty 130 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g NJ2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NJ rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 280×93 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 930/1130 kN pair here belongs to NJ2326 as printed, not to the bare size.", "Open NJ2326 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The NJ rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 280×93 mm envelope matches.", "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2326?", "a": "NJ2326 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2326 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2326 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2326 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2326-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2326", "NJ2326" ], "locale_variants": {} }, { "sku": "NJ2326E", "brand": "NTN", "manufacturer_designation": "NTN NJ2326E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1020, "static_load_kN": 1230, "fatigue_load_limit_kN": 121, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2326E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1020 kN dynamic rating in the 130 mm bore. Numbering ties NJ2326E to its envelope: type code NJ, series NJ2300, 130 mm bore; the 280×93 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 2,000 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,300 r/min for continuously high-duty 130 mm positions. Housing and shaft fillets must clear the ring chamfers of NJ2326E; an oversized radius locks the ring on its face and tilts the 93 mm-wide seat.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NJ2326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NJ2326E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1230 kN pair here belongs to NJ2326E as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1230 kN pair here belongs to NJ2326E as printed, not to the bare size.", "The 1020/1230 kN ratings, 121 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2326E?", "a": "NJ2326E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1230 kN, Pu 121 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2326E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2326E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2326E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2326E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2326E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2326e", "NJ2326E" ], "locale_variants": {} }, { "sku": "NJ326", "brand": "NTN", "manufacturer_designation": "NTN NJ326", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 665, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ326 on the 130×280 mm envelope, 58 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,500 r/min. Digit by digit, NJ326 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,900 r/min with oil versus 2,500 r/min with grease (a 400 r/min band), lubrication choice for NJ326 is a thermal decision, not just a sealing one. Equivalent-load planning treats NJ326 as a pure radial bearing: keep P below 620 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ326 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NJ326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NJ326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ326 skids at 2,500 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NJ326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ326?", "a": "NJ326 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ326 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ326 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ326 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ326-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj326", "NJ326" ], "locale_variants": {} }, { "sku": "NJ326E", "brand": "NTN", "manufacturer_designation": "NTN NJ326E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 735, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ326E appears as a 130 mm bore single-row cylindrical roller bearing (685 kN C / 735 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NJ326E to its envelope: type code NJ, series NJ300, 130 mm bore; the 280×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,600 r/min with oil versus 2,200 r/min with grease (a 400 r/min band), lubrication choice for NJ326E is a thermal decision, not just a sealing one. Mass Dimensions 130×280×58 mm and the 685 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ326E execution. Housing and shaft fillets must clear the ring chamfers of NJ326E; an oversized radius locks the ring on its face and tilts the 58 mm-wide seat.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NJ326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NJ326E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.", "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NJ326E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 685/735 kN ratings, 72 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ326E?", "a": "NJ326E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 735 kN, Pu 72 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ326E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ326E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ326E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ326E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ326E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj326e", "NJ326E" ], "locale_variants": {} }, { "sku": "NU2326", "brand": "NTN", "manufacturer_designation": "NTN NU2326", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1130, "fatigue_load_limit_kN": 111, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 26400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2326 on the 130×280 mm envelope, 93 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,200 r/min. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 280 mm OD and 93 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU2326 designation when purchasing. Mass 26400 g for the 130×280×93 mm NU2326 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 130 mm shaft.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g NU2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 93 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2326 skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "Open NU2326 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2326?", "a": "NU2326 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2326 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2326 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2326 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2326-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2326", "NU2326" ], "locale_variants": {} }, { "sku": "NU2326E", "brand": "NTN", "manufacturer_designation": "NTN NU2326E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1020, "static_load_kN": 1230, "fatigue_load_limit_kN": 121, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2326E denotes a 130×280×93 mm (5.118 × 11.024 × 3.661 in) cylindrical roller bearing in the NU2300 family, the high-capacity pressed-steel cage of the E execution. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU2326E designation when purchasing. The 7.8 kN-per-mm-bore figure (1020 kN over 130 mm) lets a NU2326E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU2326E; an oversized radius locks the ring on its face and tilts the 93 mm-wide seat.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NU2326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.", "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×93 mm envelope matches.", "If the shaft must be located both ways, do not use NU2326E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "The 1020/1230 kN ratings, 121 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2326E?", "a": "NU2326E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1230 kN, Pu 121 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2326E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2326E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2326E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2326E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2326E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2326e", "NU2326E" ], "locale_variants": {} }, { "sku": "NU326", "brand": "NTN", "manufacturer_designation": "NTN NU326", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 665, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU326 appears as a 130 mm bore single-row cylindrical roller bearing (620 kN C / 665 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU326. Speed ratio check: limiting 2,500 r/min is .86 of the 2,900 r/min oil value for NU326; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU326 non-locating position preloads the bearing when the shaft grows.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NU326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NU326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NU326 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.", "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU326?", "a": "NU326 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU326 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU326 is supplied in the standard open execution shown in the table." }, { "q": "Can NU326 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU326-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu326", "NU326" ], "locale_variants": {} }, { "sku": "NU326E", "brand": "NTN", "manufacturer_designation": "NTN NU326E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 735, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies NU326E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU326E floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 167 mm — the envelope inside the 130/280 mm bore/OD where the rollers actually run. Mass Dimensions 130×280×58 mm and the 685 kN C rating define the substitution envelope; check the 2203E mass column for this exact NU326E execution. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NU326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU326E skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "Open NU326E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.", "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.", "The 685/735 kN ratings, 72 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU326E?", "a": "NU326E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 735 kN, Pu 72 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU326E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU326E is supplied in the standard open execution shown in the table." }, { "q": "Can NU326E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU326E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU326E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu326e", "NU326E" ], "locale_variants": {} }, { "sku": "NUP2326", "brand": "NTN", "manufacturer_designation": "NTN NUP2326", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1130, "fatigue_load_limit_kN": 111, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 26400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies NUP2326: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 280 mm OD and 93 mm width from the ISO 15 general plan. With C 930 kN and C0 1130 kN (C0/C ≈ 1.22) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 130 mm (5.118 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 93 mm-wide ring. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g NUP2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 93 mm-wide cavity.", "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.", "Do not replace NUP2326 with a deep-groove ball bearing on rating alone: line contact gives 930 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2326 skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2326?", "a": "NUP2326 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2326 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2326 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2326 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2326-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2326", "NUP2326" ], "locale_variants": {} }, { "sku": "NUP2326E", "brand": "NTN", "manufacturer_designation": "NTN NUP2326E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1020, "static_load_kN": 1230, "fatigue_load_limit_kN": 121, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2326E is the extra-wide (23) section of the NTN NUP2300 dimension series for a 130 mm shaft — 1020 kN of basic dynamic capacity in a open bearing. Digit by digit, NUP2326E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NUP2326E as a pure radial bearing: keep P below 1020 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP2326E; an oversized radius locks the ring on its face and tilts the 93 mm-wide seat.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NUP2326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP2326E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NUP2326E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "Open NUP2326E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1230 kN pair here belongs to NUP2326E as printed, not to the bare size.", "The 1020/1230 kN ratings, 121 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2326E?", "a": "NUP2326E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1230 kN, Pu 121 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2326E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2326E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2326E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2326E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2326E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2326e", "NUP2326E" ], "locale_variants": {} }, { "sku": "NUP326", "brand": "NTN", "manufacturer_designation": "NTN NUP326", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 665, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP326 denotes a 130×280×58 mm (5.118 × 11.024 × 2.283 in) cylindrical roller bearing in the NUP300 family, a pressed sheet-steel cage. Numbering ties NUP326 to its envelope: type code NUP, series NUP300, 130 mm bore; the 280×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 620 kN and C0 665 kN (C0/C ≈ 1.07) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 620 kN C assumes clean oil and adequate film; the 65.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NUP326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 620/665 kN pair here belongs to NUP326 as printed, not to the bare size.", "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP326 skids at 2,500 r/min and fails by smearing long before L10 fatigue.", "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP326?", "a": "NUP326 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP326 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP326 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP326 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP326?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP326-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup326", "NUP326" ], "locale_variants": {} }, { "sku": "NUP326E", "brand": "NTN", "manufacturer_designation": "NTN NUP326E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 735, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP326E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 685 kN dynamic rating in the 130 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP326E floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 130 mm (5.118 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP326E.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NUP326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP326E skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 685/735 kN pair here belongs to NUP326E as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP326E skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 685/735 kN pair here belongs to NUP326E as printed, not to the bare size.", "The 685/735 kN ratings, 72 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP326E?", "a": "NUP326E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 735 kN, Pu 72 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP326E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP326E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP326E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP326E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP326E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup326e", "NUP326E" ], "locale_variants": {} }, { "sku": "NN4928", "brand": "NTN", "manufacturer_designation": "NTN NN4928", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 251, "static_load_kN": 470, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3600, "weight_g": 3760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NN4928: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,000 r/min on grease and 3,600 r/min on oil. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4928 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 140 mm (5.512 in) bore and 190 mm (7.48 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 50 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 140 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 3760 g NN4928 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NN4928 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 190×50 mm envelope matches.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4928 does not substitute a precision-class execution.", "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 251/470 kN ratings, 49 kN Pu and 3760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4928 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4928?", "a": "NN4928 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 190 mm OD and 50 mm width (5.512 × 7.48 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 251 kN, C0 470 kN, Pu 49 kN, grease limiting speed 3,000 r/min, oil 3,600 r/min, mass about 3760 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4928 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4928 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4928?", "a": "NN4928 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN4928?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm. The nominal bore/OD remain 140/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4928", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4928", "NN4928" ], "locale_variants": {} }, { "sku": "NN4928K", "brand": "NTN", "manufacturer_designation": "NTN NN4928K", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 251, "static_load_kN": 470, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3600, "weight_g": 3580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NN4928K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,000 r/min on grease and 3,600 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 190 mm OD and 50 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,000 r/min grease and 3,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. Thermal planning around the 3,000 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 3,600 r/min for continuously high-duty 140 mm positions. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 3580 g NN4928K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The K tapered bore of NN4928K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 190×50 mm envelope matches.", "Open NN4928K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "The K tapered bore of NN4928K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "The 251/470 kN ratings, 49 kN Pu and 3580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4928K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4928K?", "a": "NN4928K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 190 mm OD and 50 mm width (5.512 × 7.48 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 251 kN, C0 470 kN, Pu 49 kN, grease limiting speed 3,000 r/min, oil 3,600 r/min, mass about 3580 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4928K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4928K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4928K?", "a": "The K suffix denotes a 1:12 tapered bore. NN4928K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4928 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN4928K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm. The nominal bore/OD remain 140/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4928K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4928k", "NN4928K" ], "locale_variants": {} }, { "sku": "NNU4928K", "brand": "NTN", "manufacturer_designation": "NTN NNU4928K", "series": "NNU4900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 251, "static_load_kN": 470, "fatigue_load_limit_kN": 49, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3600, "weight_g": 3760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NNU4928K denotes a 140×190×50 mm (5.512 × 7.48 × 1.969 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 49 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.87 (470/251 kN) shows the high-static-capacity proportioning of this 140 mm bore. Housing and shaft fillets must clear the ring chamfers of NNU4928K; an oversized radius locks the ring on its face and tilts the 50 mm-wide seat.", "applications": [ "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 3760 g NNU4928K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NNU rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 190×50 mm envelope matches.", "Grease limiting speed 3,000 r/min and oil 3,600 r/min are different limits for NNU4928K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 251/470 kN pair here belongs to NNU4928K as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 251/470 kN pair here belongs to NNU4928K as printed, not to the bare size.", "The 251/470 kN ratings, 49 kN Pu and 3760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4928K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNU4928K?", "a": "NNU4928K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 190 mm OD and 50 mm width (5.512 × 7.48 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 251 kN, C0 470 kN, Pu 49 kN, grease limiting speed 3,000 r/min, oil 3,600 r/min, mass about 3760 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4928K is the NNU execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4928K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4928K?", "a": "The K suffix denotes a 1:12 tapered bore. NNU4928K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4928 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NNU4928K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm. The nominal bore/OD remain 140/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NNU4928K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nnu4928k", "NNU4928K" ], "locale_variants": {} }, { "sku": "N1028", "brand": "NTN", "manufacturer_designation": "NTN N1028", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 250, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 3980, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N1028 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 195 kN dynamic rating in the 140 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 210 mm OD and 33 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1028 designation when purchasing. Rating life at 195 kN C assumes clean oil and adequate film; the 25.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g N1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use N1028 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 3,200 r/min and oil 3,800 r/min are different limits for N1028: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1028?", "a": "N1028 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1028 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1028 is supplied in the standard open execution shown in the table." }, { "q": "Can N1028 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1028?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1028", "N1028" ], "locale_variants": {} }, { "sku": "NJ1028", "brand": "NTN", "manufacturer_designation": "NTN NJ1028", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 250, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 3980, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NJ1028: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,200 r/min on grease and 3,800 r/min on oil. Numbering ties NJ1028 to its envelope: type code NJ, series NJ1000, 140 mm bore; the 210×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 195 kN and C0 250 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 1.4 kN-per-mm-bore figure (195 kN over 140 mm) lets a NJ1028 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 140 mm shaft.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g NJ1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 210×33 mm envelope matches.", "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Open NJ1028 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1028 skids at 3,200 r/min and fails by smearing long before L10 fatigue.", "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1028?", "a": "NJ1028 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1028 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1028 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1028 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1028?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1028", "NJ1028" ], "locale_variants": {} }, { "sku": "NN3028", "brand": "NTN", "manufacturer_designation": "NTN NN3028", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 515, "fatigue_load_limit_kN": 53, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_g": 6440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3028 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 140×210×53 mm ISO 15 envelope. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Equivalent-load planning treats NN3028 as a pure radial bearing: keep P below 330 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3028.", "applications": [ "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles", "CNC lathe and machining-centre spindle radial sets" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 6440 g NN3028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Grease limiting speed 2,800 r/min and oil 3,300 r/min are different limits for NN3028: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 210×53 mm envelope matches.", "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3028 does not substitute a precision-class execution.", "The 53 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 330/515 kN ratings, 53 kN Pu and 6440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3028?", "a": "NN3028 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 515 kN, Pu 53 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 6440 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3028 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3028 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3028?", "a": "NN3028 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3028?", "a": "NTN rates NN3028 at 2,800 r/min with grease and 3,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3028", "NN3028" ], "locale_variants": {} }, { "sku": "NN3028K", "brand": "NTN", "manufacturer_designation": "NTN NN3028K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 515, "fatigue_load_limit_kN": 53, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_g": 6210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN3028K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 140×210×53 mm ISO 15 envelope. Numbering ties NN3028K to its envelope: type code NN, series NN3000, 140 mm bore; the 210×53 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 53 mm width and 35.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 2,800 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 3,300 r/min for continuously high-duty 140 mm positions. Housing and shaft fillets must clear the ring chamfers of NN3028K; an oversized radius locks the ring on its face and tilts the 53 mm-wide seat.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 6210 g NN3028K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 210×53 mm envelope matches.", "Grease limiting speed 2,800 r/min and oil 3,300 r/min are different limits for NN3028K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 53 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "Open NN3028K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "The 330/515 kN ratings, 53 kN Pu and 6210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3028K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3028K?", "a": "NN3028K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 515 kN, Pu 53 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 6210 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3028K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3028K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3028K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3028K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3028 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3028K?", "a": "NTN rates NN3028K at 2,800 r/min with grease and 3,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3028K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3028k", "NN3028K" ], "locale_variants": {} }, { "sku": "NU1028", "brand": "NTN", "manufacturer_designation": "NTN NU1028", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 250, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 3980, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1028 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 140×210×33 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1028. Speed ratio check: limiting 3,200 r/min is .84 of the 3,800 r/min oil value for NU1028; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1028.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g NU1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "Grease limiting speed 3,200 r/min and oil 3,800 r/min are different limits for NU1028: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Open NU1028 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 210 mm race brinells and releases as vibration within hours.", "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1028?", "a": "NU1028 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1028 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1028 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1028 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1028?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1028-ML", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1028", "NU1028" ], "locale_variants": {} }, { "sku": "NUP1028", "brand": "NTN", "manufacturer_designation": "NTN NUP1028", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 250, "fatigue_load_limit_kN": 25.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 3980, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP1028 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 140×210×33 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1028 designation when purchasing. Mass 3980 g for the 140×210×33 mm NUP1028 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP1028; an oversized radius locks the ring on its face and tilts the 33 mm-wide seat.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g NUP1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.", "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 210×33 mm envelope matches.", "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1028?", "a": "NUP1028 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1028 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1028 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1028 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1028?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1028", "NUP1028" ], "locale_variants": {} }, { "sku": "N2228", "brand": "NTN", "manufacturer_designation": "NTN N2228", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 495, "static_load_kN": 635, "fatigue_load_limit_kN": 63.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 12600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2228 appears as a 140 mm bore single-row cylindrical roller bearing (495 kN C / 635 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N2228 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Rating life at 495 kN C assumes clean oil and adequate film; the 63.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 140 mm shaft.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g N2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2228 skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The N rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 250×68 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/635 kN pair here belongs to N2228 as printed, not to the bare size.", "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2228?", "a": "N2228 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2228 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2228 is supplied in the standard open execution shown in the table." }, { "q": "Can N2228 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2228", "N2228" ], "locale_variants": {} }, { "sku": "N228", "brand": "NTN", "manufacturer_designation": "NTN N228", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 345, "static_load_kN": 400, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 7720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N228 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 140×250×42 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 250 mm OD and 42 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,700 r/min grease and 3,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 140 mm (5.512 in) bore and 250 mm (9.843 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 42 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 140 mm shaft.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g N228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 42 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for N228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for N228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use N228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N228?", "a": "N228 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N228 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N228 is supplied in the standard open execution shown in the table." }, { "q": "Can N228 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n228", "N228" ], "locale_variants": {} }, { "sku": "NF228", "brand": "NTN", "manufacturer_designation": "NTN NF228", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 345, "static_load_kN": 400, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 7720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF228 is the standard section of the NTN NF200 dimension series for a 140 mm shaft — 345 kN of basic dynamic capacity in a 7720 g, open bearing. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF228. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,100 r/min for continuously high-duty 140 mm positions. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NF228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NF228 with a deep-groove ball bearing on rating alone: line contact gives 345 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NF228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.", "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF228?", "a": "NF228 is an NTN NF single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF228 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF228 is supplied in the standard open execution shown in the table." }, { "q": "Can NF228 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf228", "NF228" ], "locale_variants": {} }, { "sku": "NJ2228", "brand": "NTN", "manufacturer_designation": "NTN NJ2228", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 495, "static_load_kN": 635, "fatigue_load_limit_kN": 63.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 12600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2228 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 495 kN dynamic rating in the 140 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,400 r/min grease and 2,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g NJ2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 55.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.", "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 250×68 mm envelope matches.", "Open NJ2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "If the shaft must be located both ways, do not use NJ2228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2228?", "a": "NJ2228 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2228 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2228 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2228 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2228-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2228", "NJ2228" ], "locale_variants": {} }, { "sku": "NJ2228E", "brand": "NTN", "manufacturer_designation": "NTN NJ2228E", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 635, "static_load_kN": 835, "fatigue_load_limit_kN": 83, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2228E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 140×250×68 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). At 2,500 r/min with oil versus 2,100 r/min with grease (a 400 r/min band), lubrication choice for NJ2228E is a thermal decision, not just a sealing one. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,500 r/min for continuously high-duty 140 mm positions. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NJ2228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 55.0 mm section at 140 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2228E skids at 2,100 r/min and fails by smearing long before L10 fatigue.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 635/835 kN pair here belongs to NJ2228E as printed, not to the bare size.", "Grease limiting speed 2,100 r/min and oil 2,500 r/min are different limits for NJ2228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 635/835 kN ratings, 83 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2228E?", "a": "NJ2228E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 635 kN, C0 835 kN, Pu 83 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2228E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2228E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2228E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2228E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2228E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2228e", "NJ2228E" ], "locale_variants": {} }, { "sku": "NJ228", "brand": "NTN", "manufacturer_designation": "NTN NJ228", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 345, "static_load_kN": 400, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 7720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ228 on the 140×250 mm envelope, 42 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,700 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,700 r/min grease and 3,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 140 mm (5.512 in) bore and 250 mm (9.843 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 42 mm-wide ring. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NJ228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NJ228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NJ228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ228?", "a": "NJ228 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ228 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ228 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ228 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ228-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj228", "NJ228" ], "locale_variants": {} }, { "sku": "NJ228E", "brand": "NTN", "manufacturer_designation": "NTN NJ228E", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 435, "static_load_kN": 515, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NJ228E on the 140×250 mm envelope, 42 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,400 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). With C 435 kN and C0 515 kN (C0/C ≈ 1.18) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Mass Dimensions 140×250×42 mm and the 435 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ228E execution. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NJ228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NJ228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ228E skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "The 435/515 kN ratings, 51 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ228E?", "a": "NJ228E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 515 kN, Pu 51 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ228E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ228E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ228E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ228E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ228E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj228e", "NJ228E" ], "locale_variants": {} }, { "sku": "NU2228", "brand": "NTN", "manufacturer_designation": "NTN NU2228", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 495, "static_load_kN": 635, "fatigue_load_limit_kN": 63.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 12600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU2228 on the 140×250 mm envelope, 68 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,400 r/min. Numbering ties NU2228 to its envelope: type code NU, series NU2200, 140 mm bore; the 250×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 55.0 mm radial section ((250−140)/2) frames the roller complement; capacity per millimetre of bore is about 3.5 kN/mm before application factors. The 3.5 kN-per-mm-bore figure (495 kN over 140 mm) lets a NU2228 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2228 non-locating position preloads the bearing when the shaft grows.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g NU2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NU2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NU2228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 55.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.", "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2228?", "a": "NU2228 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2228 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2228 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2228 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2228-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2228", "NU2228" ], "locale_variants": {} }, { "sku": "NU2228E", "brand": "NTN", "manufacturer_designation": "NTN NU2228E", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 635, "static_load_kN": 835, "fatigue_load_limit_kN": 83, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2228E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 635 kN dynamic rating in the 140 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 250 mm OD and 68 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,100 r/min grease and 2,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 4.5 kN-per-mm-bore figure (635 kN over 140 mm) lets a NU2228E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NU2228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NU2228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NU2228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 635/835 kN ratings, 83 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2228E?", "a": "NU2228E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 635 kN, C0 835 kN, Pu 83 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2228E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2228E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2228E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2228E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2228E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2228e", "NU2228E" ], "locale_variants": {} }, { "sku": "NU228", "brand": "NTN", "manufacturer_designation": "NTN NU228", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 345, "static_load_kN": 400, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 7720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU228 appears as a 140 mm bore single-row cylindrical roller bearing (345 kN C / 400 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU228 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU228 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NU228 as a pure radial bearing: keep P below 345 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NU228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NU rib arrangement is not interchangeable with another prefix on the same 140 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.", "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for NU228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU228?", "a": "NU228 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU228 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU228 is supplied in the standard open execution shown in the table." }, { "q": "Can NU228 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU228-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu228", "NU228" ], "locale_variants": {} }, { "sku": "NU228E", "brand": "NTN", "manufacturer_designation": "NTN NU228E", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 435, "static_load_kN": 515, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU228E denotes a 140×250×42 mm (5.512 × 9.843 × 1.654 in) cylindrical roller bearing in the NU200 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NU228E to its envelope: type code NU, series NU200, 140 mm bore; the 250×42 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 2,400 r/min grease and 2,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. Selection arithmetic: Pu 51 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.18 (515/435 kN) shows the high-static-capacity proportioning of this 140 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU228E non-locating position preloads the bearing when the shaft grows.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NU228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NU228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NU228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "If the shaft must be located both ways, do not use NU228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 435/515 kN ratings, 51 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU228E?", "a": "NU228E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 515 kN, Pu 51 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU228E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU228E is supplied in the standard open execution shown in the table." }, { "q": "Can NU228E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU228E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU228E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu228e", "NU228E" ], "locale_variants": {} }, { "sku": "NUP2228", "brand": "NTN", "manufacturer_designation": "NTN NUP2228", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 495, "static_load_kN": 635, "fatigue_load_limit_kN": 63.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_g": 12600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NUP2228: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,400 r/min on grease and 2,800 r/min on oil. Numbering ties NUP2228 to its envelope: type code NUP, series NUP2200, 140 mm bore; the 250×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2228 designation when purchasing. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,800 r/min for continuously high-duty 140 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2228 non-locating position preloads the bearing when the shaft grows.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g NUP2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NUP2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "Open NUP2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "Do not replace NUP2228 with a deep-groove ball bearing on rating alone: line contact gives 495 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2228?", "a": "NUP2228 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2228 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2228 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2228 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2228-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2228", "NUP2228" ], "locale_variants": {} }, { "sku": "NUP2228E", "brand": "NTN", "manufacturer_designation": "NTN NUP2228E", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 635, "static_load_kN": 835, "fatigue_load_limit_kN": 83, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NUP2228E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,100 r/min on grease and 2,500 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2228E floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. At 2,500 r/min with oil versus 2,100 r/min with grease (a 400 r/min band), lubrication choice for NUP2228E is a thermal decision, not just a sealing one. Equivalent-load planning treats NUP2228E as a pure radial bearing: keep P below 635 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NUP2228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NUP2228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NUP2228E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "Grease limiting speed 2,100 r/min and oil 2,500 r/min are different limits for NUP2228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 635/835 kN ratings, 83 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2228E?", "a": "NUP2228E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 635 kN, C0 835 kN, Pu 83 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2228E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2228E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2228E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2228E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2228E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2228e", "NUP2228E" ], "locale_variants": {} }, { "sku": "NUP228", "brand": "NTN", "manufacturer_designation": "NTN NUP228", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 345, "static_load_kN": 400, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 2700, "max_rpm": 2700, "speed_oil_rpm": 3100, "weight_g": 7720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP228 denotes a 140×250×42 mm (5.512 × 9.843 × 1.654 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. Digit by digit, NUP228 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP228 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,100 r/min for continuously high-duty 140 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP228.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NUP228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for NUP228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.", "Do not replace NUP228 with a deep-groove ball bearing on rating alone: line contact gives 345 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP228?", "a": "NUP228 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP228 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP228 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP228 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP228?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP228-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup228", "NUP228" ], "locale_variants": {} }, { "sku": "NUP228E", "brand": "NTN", "manufacturer_designation": "NTN NUP228E", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 435, "static_load_kN": 515, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2400, "max_rpm": 2400, "speed_oil_rpm": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP228E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 140×250×42 mm ISO 15 envelope. Numbering ties NUP228E to its envelope: type code NUP, series NUP200, 140 mm bore; the 250×42 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,800 r/min with oil versus 2,400 r/min with grease (a 400 r/min band), lubrication choice for NUP228E is a thermal decision, not just a sealing one. The 140 mm (5.512 in) bore and 250 mm (9.843 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 42 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP228E non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NUP228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NUP228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NUP228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP228E skids at 2,400 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NUP228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 435/515 kN ratings, 51 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP228E?", "a": "NUP228E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 515 kN, Pu 51 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP228E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP228E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP228E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP228E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP228E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup228e", "NUP228E" ], "locale_variants": {} }, { "sku": "N2328", "brand": "NTN", "manufacturer_designation": "NTN N2328", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1020, "static_load_kN": 1250, "fatigue_load_limit_kN": 120, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2300, "weight_g": 33100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2328 is the extra-wide (23) section of the NTN N2300 dimension series for a 140 mm shaft — 1020 kN of basic dynamic capacity in a 33100 g, open bearing. Numbering ties N2328 to its envelope: type code N, series N2300, 140 mm bore; the 300×102 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2328 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 120 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.23 (1250/1020 kN) shows the high-static-capacity proportioning of this 140 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 140 mm shaft.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g N2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1250 kN pair here belongs to N2328 as printed, not to the bare size.", "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 102 mm-wide cavity.", "Do not replace N2328 with a deep-groove ball bearing on rating alone: line contact gives 1020 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Do not replace N2328 with a deep-groove ball bearing on rating alone: line contact gives 1020 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2328?", "a": "N2328 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2328 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2328 is supplied in the standard open execution shown in the table." }, { "q": "Can N2328 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2328", "N2328" ], "locale_variants": {} }, { "sku": "N328", "brand": "NTN", "manufacturer_designation": "NTN N328", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 745, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_g": 20700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N328 on the 140×300 mm envelope, 62 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,300 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N328 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N328. Rating life at 685 kN C assumes clean oil and adequate film; the 72 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g N328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The N rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.", "If the shaft must be located both ways, do not use N328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.", "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N328?", "a": "N328 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N328 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N328 is supplied in the standard open execution shown in the table." }, { "q": "Can N328 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n328", "N328" ], "locale_variants": {} }, { "sku": "NF328", "brand": "NTN", "manufacturer_designation": "NTN NF328", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 745, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_g": 20700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF328 denotes a 140×300×62 mm (5.512 × 11.811 × 2.441 in) cylindrical roller bearing in the NF300 family, a pressed sheet-steel cage. Digit by digit, NF328 reads as NF (one rib on each ring), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 685 kN and C0 745 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Selection arithmetic: Pu 72 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (745/685 kN) shows the high-static-capacity proportioning of this 140 mm bore. Housing and shaft fillets must clear the ring chamfers of NF328; an oversized radius locks the ring on its face and tilts the 62 mm-wide seat.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NF328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 685/745 kN pair here belongs to NF328 as printed, not to the bare size.", "If the shaft must be located both ways, do not use NF328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF328 skids at 2,300 r/min and fails by smearing long before L10 fatigue.", "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF328?", "a": "NF328 is an NTN NF single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF328 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF328 is supplied in the standard open execution shown in the table." }, { "q": "Can NF328 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf328", "NF328" ], "locale_variants": {} }, { "sku": "NJ2328", "brand": "NTN", "manufacturer_designation": "NTN NJ2328", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1020, "static_load_kN": 1250, "fatigue_load_limit_kN": 120, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2300, "weight_g": 33100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2328 appears as a 140 mm bore single-row cylindrical roller bearing (1020 kN C / 1250 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ2328 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2328. Speed ratio check: limiting 2,000 r/min is .87 of the 2,300 r/min oil value for NJ2328; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2328.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g NJ2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NJ2328 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "Open NJ2328 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.", "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.", "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2328?", "a": "NJ2328 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2328 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2328 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2328 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2328-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2328", "NJ2328" ], "locale_variants": {} }, { "sku": "NJ2328E", "brand": "NTN", "manufacturer_designation": "NTN NJ2328E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 1380, "fatigue_load_limit_kN": 133, "limiting_speed_rpm": 1800, "max_rpm": 1800, "speed_oil_rpm": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NJ2328E denotes a 140×300×102 mm (5.512 × 11.811 × 4.016 in) cylindrical roller bearing in the NJ2300 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2328E floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. With C 1130 kN and C0 1380 kN (C0/C ≈ 1.22) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Mass Dimensions 140×300×102 mm and the 1130 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ2328E execution. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2328E.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NJ2328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.", "Do not replace NJ2328E with a deep-groove ball bearing on rating alone: line contact gives 1130 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2328E skids at 1,800 r/min and fails by smearing long before L10 fatigue.", "The 1130/1380 kN ratings, 133 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2328E?", "a": "NJ2328E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1380 kN, Pu 133 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2328E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2328E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2328E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2328E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2328E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2328e", "NJ2328E" ], "locale_variants": {} }, { "sku": "NJ328", "brand": "NTN", "manufacturer_designation": "NTN NJ328", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 745, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_g": 20700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NJ328: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,300 r/min on grease and 2,700 r/min on oil. Numbering ties NJ328 to its envelope: type code NJ, series NJ300, 140 mm bore; the 300×62 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 685 kN and C0 745 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Mass 20700 g for the 140×300×62 mm NJ328 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NJ328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 62 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 62 mm-wide cavity.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ328 skids at 2,300 r/min and fails by smearing long before L10 fatigue.", "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ328?", "a": "NJ328 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ328 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ328 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ328 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ328-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj328", "NJ328" ], "locale_variants": {} }, { "sku": "NJ328E", "brand": "NTN", "manufacturer_designation": "NTN NJ328E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 795, "fatigue_load_limit_kN": 76.5, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ328E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 140×300×62 mm ISO 15 envelope. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ328E floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 180 mm — the envelope inside the 140/300 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ328E.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NJ328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ328E skids at 2,100 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 2,100 r/min and oil 2,400 r/min are different limits for NJ328E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "If the shaft must be located both ways, do not use NJ328E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.", "The 735/795 kN ratings, 76.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ328E?", "a": "NJ328E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 795 kN, Pu 76.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ328E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ328E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ328E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ328E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ328E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj328e", "NJ328E" ], "locale_variants": {} }, { "sku": "NU2328", "brand": "NTN", "manufacturer_designation": "NTN NU2328", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1020, "static_load_kN": 1250, "fatigue_load_limit_kN": 120, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2300, "weight_g": 33100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NU2328: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,000 r/min on grease and 2,300 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2328 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 2,000 r/min grease and 2,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 140 mm (5.512 in) bore and 300 mm (11.811 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 102 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2328 non-locating position preloads the bearing when the shaft grows.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g NU2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.", "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 102 mm-wide cavity.", "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "If the shaft must be located both ways, do not use NU2328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2328?", "a": "NU2328 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2328 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2328 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2328 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2328-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2328", "NU2328" ], "locale_variants": {} }, { "sku": "NU2328E", "brand": "NTN", "manufacturer_designation": "NTN NU2328E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 1380, "fatigue_load_limit_kN": 133, "limiting_speed_rpm": 1800, "max_rpm": 1800, "speed_oil_rpm": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NU2328E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,800 r/min on grease and 2,100 r/min on oil. Numbering ties NU2328E to its envelope: type code NU, series NU2300, 140 mm bore; the 300×102 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU2328E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,800 r/min is .86 of the 2,100 r/min oil value for NU2328E; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2328E.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NU2328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2328E skids at 1,800 r/min and fails by smearing long before L10 fatigue.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NU2328E with a deep-groove ball bearing on rating alone: line contact gives 1130 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 1130/1380 kN ratings, 133 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2328E?", "a": "NU2328E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1380 kN, Pu 133 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2328E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2328E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2328E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2328E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2328E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2328e", "NU2328E" ], "locale_variants": {} }, { "sku": "NU328", "brand": "NTN", "manufacturer_designation": "NTN NU328", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 745, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_g": 20700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU328 is the standard section of the NTN NU300 dimension series for a 140 mm shaft — 685 kN of basic dynamic capacity in a 20700 g, open bearing. Digit by digit, NU328 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU328 designation when purchasing. Selection arithmetic: Pu 72 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (745/685 kN) shows the high-static-capacity proportioning of this 140 mm bore. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NU328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 62 mm-wide cavity.", "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.", "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU328?", "a": "NU328 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU328 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU328 is supplied in the standard open execution shown in the table." }, { "q": "Can NU328 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU328-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu328", "NU328" ], "locale_variants": {} }, { "sku": "NU328E", "brand": "NTN", "manufacturer_designation": "NTN NU328E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 795, "fatigue_load_limit_kN": 76.5, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU328E is the standard section of the NTN NU300 dimension series for a 140 mm shaft — 735 kN of basic dynamic capacity in a open bearing. Digit by digit, NU328E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU328E designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU328E non-locating position preloads the bearing when the shaft grows.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NU328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/795 kN pair here belongs to NU328E as printed, not to the bare size.", "The NU rib arrangement is not interchangeable with another prefix on the same 140 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.", "If the shaft must be located both ways, do not use NU328E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "The 735/795 kN ratings, 76.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU328E?", "a": "NU328E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 795 kN, Pu 76.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU328E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU328E is supplied in the standard open execution shown in the table." }, { "q": "Can NU328E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU328E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU328E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu328e", "NU328E" ], "locale_variants": {} }, { "sku": "NUP2328", "brand": "NTN", "manufacturer_designation": "NTN NUP2328", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1020, "static_load_kN": 1250, "fatigue_load_limit_kN": 120, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2300, "weight_g": 33100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2328 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1020 kN dynamic rating in the 140 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2328 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 260 mm — the envelope inside the 140/300 mm bore/OD where the rollers actually run. The 7.3 kN-per-mm-bore figure (1020 kN over 140 mm) lets a NUP2328 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g NUP2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2328 skids at 2,000 r/min and fails by smearing long before L10 fatigue.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.", "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.", "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2328?", "a": "NUP2328 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2328 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2328 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2328 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2328-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2328", "NUP2328" ], "locale_variants": {} }, { "sku": "NUP2328E", "brand": "NTN", "manufacturer_designation": "NTN NUP2328E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 1380, "fatigue_load_limit_kN": 133, "limiting_speed_rpm": 1800, "max_rpm": 1800, "speed_oil_rpm": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP2328E on the 140×300 mm envelope, 102 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,800 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 300 mm OD and 102 mm width from the ISO 15 general plan. With C 1130 kN and C0 1380 kN (C0/C ≈ 1.22) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 1130 kN C assumes clean oil and adequate film; the 133 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2328E.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NUP2328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 102 mm-wide cavity.", "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1130/1380 kN pair here belongs to NUP2328E as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2328E skids at 1,800 r/min and fails by smearing long before L10 fatigue.", "The 1130/1380 kN ratings, 133 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2328E?", "a": "NUP2328E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1380 kN, Pu 133 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2328E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2328E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2328E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2328E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2328E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2328e", "NUP2328E" ], "locale_variants": {} }, { "sku": "NUP328", "brand": "NTN", "manufacturer_designation": "NTN NUP328", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 685, "static_load_kN": 745, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 2300, "max_rpm": 2300, "speed_oil_rpm": 2700, "weight_g": 20700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP328 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 140×300×62 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 300 mm OD and 62 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 260 mm — the envelope inside the 140/300 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP328.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NUP328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "If the shaft must be located both ways, do not use NUP328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Do not replace NUP328 with a deep-groove ball bearing on rating alone: line contact gives 685 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.", "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.", "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP328?", "a": "NUP328 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP328 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP328 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP328 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP328?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP328-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup328", "NUP328" ], "locale_variants": {} }, { "sku": "NUP328E", "brand": "NTN", "manufacturer_designation": "NTN NUP328E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 795, "fatigue_load_limit_kN": 76.5, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NUP328E denotes a 140×300×62 mm (5.512 × 11.811 × 2.441 in) cylindrical roller bearing in the NUP300 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NUP328E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 735 kN and C0 795 kN (C0/C ≈ 1.08) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,400 r/min for continuously high-duty 140 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NUP328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/795 kN pair here belongs to NUP328E as printed, not to the bare size.", "If the shaft must be located both ways, do not use NUP328E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP328E skids at 2,100 r/min and fails by smearing long before L10 fatigue.", "The 735/795 kN ratings, 76.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP328E?", "a": "NUP328E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 795 kN, Pu 76.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP328E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP328E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP328E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP328E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP328E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup328e", "NUP328E" ], "locale_variants": {} }, { "sku": "NN4930", "brand": "NTN", "manufacturer_designation": "NTN NN4930", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 690, "fatigue_load_limit_kN": 70.5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_g": 5900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN4930 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 380 kN dynamic rating in the 150 mm bore. Digit by digit, NN4930 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 380 kN and C0 690 kN (C0/C ≈ 1.82) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Equivalent-load planning treats NN4930 as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NN4930; an oversized radius locks the ring on its face and tilts the 60 mm-wide seat.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5900 g NN4930 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NN4930 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NN rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 210×60 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4930 skids at 2,800 r/min and fails by smearing long before L10 fatigue.", "The 380/690 kN ratings, 70.5 kN Pu and 5900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4930 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4930?", "a": "NN4930 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 210 mm OD and 60 mm width (5.906 × 8.268 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 690 kN, Pu 70.5 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5900 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4930 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4930 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4930?", "a": "NN4930 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat." }, { "q": "What do Fw and Ew mean for NN4930?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 168.5 mm, Ew 196.5159 mm. The nominal bore/OD remain 150/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4930", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4930", "NN4930" ], "locale_variants": {} }, { "sku": "NN4930K", "brand": "NTN", "manufacturer_designation": "NTN NN4930K", "series": "NN4900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 690, "fatigue_load_limit_kN": 70.5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_g": 5620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NN4930K is the extra-light (10/49) section of the NTN NN4900 dimension series for a 150 mm shaft — 380 kN of basic dynamic capacity in a 5620 g, open bearing. Numbering ties NN4930K to its envelope: type code NN, series NN4900, 150 mm bore; the 210×60 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Speed ratio check: limiting 2,800 r/min is .85 of the 3,300 r/min oil value for NN4930K; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5620 g NN4930K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 30.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.", "The K tapered bore of NN4930K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 380/690 kN pair here belongs to NN4930K as printed, not to the bare size.", "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The 380/690 kN ratings, 70.5 kN Pu and 5620 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4930K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN4930K?", "a": "NN4930K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 210 mm OD and 60 mm width (5.906 × 8.268 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 690 kN, Pu 70.5 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5620 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4930K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4930K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN4930K?", "a": "The K suffix denotes a 1:12 tapered bore. NN4930K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4930 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NN4930K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 168.5 mm, Ew 196.5159 mm. The nominal bore/OD remain 150/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NN4930K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn4930k", "NN4930K" ], "locale_variants": {} }, { "sku": "NNU4930K", "brand": "NTN", "manufacturer_designation": "NTN NNU4930K", "series": "NNU4900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 690, "fatigue_load_limit_kN": 70.5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "speed_oil_rpm": 3300, "weight_g": 5900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NNU4930K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,800 r/min on grease and 3,300 r/min on oil. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4930K floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The 30.0 mm radial section ((210−150)/2) frames the roller complement; capacity per millimetre of bore is about 2.5 kN/mm before application factors. Equivalent-load planning treats NNU4930K as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "CNC lathe and machining-centre spindle radial sets", "precision rotary-table and dividing-head bearings", "high-speed turbine and turbo-blower rotor supports", "coordinate-measuring and semiconductor-equipment drives" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5900 g NNU4930K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NNU4930K with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 210 mm race brinells and releases as vibration within hours.", "The NNU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 210×60 mm envelope matches.", "The 30.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.", "The 380/690 kN ratings, 70.5 kN Pu and 5900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4930K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNU4930K?", "a": "NNU4930K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 210 mm OD and 60 mm width (5.906 × 8.268 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 690 kN, Pu 70.5 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5900 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4930K is the NNU execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4930K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4930K?", "a": "The K suffix denotes a 1:12 tapered bore. NNU4930K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4930 execution of the same envelope mounts on a plain seat." }, { "q": "What do Fw and Ew mean for NNU4930K?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 168.5 mm, Ew 196.5159 mm. The nominal bore/OD remain 150/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NNU4930K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nnu4930k", "NNU4930K" ], "locale_variants": {} }, { "sku": "N1030", "brand": "NTN", "manufacturer_designation": "NTN N1030", "series": "N1000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 224, "static_load_kN": 294, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 4700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1030 appears as a 150 mm bore single-row cylindrical roller bearing (224 kN C / 294 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). With C 224 kN and C0 294 kN (C0/C ≈ 1.31) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 150 mm (5.906 in) bore and 225 mm (8.858 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 35 mm-wide ring. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g N1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace N1030 with a deep-groove ball bearing on rating alone: line contact gives 224 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "Do not replace N1030 with a deep-groove ball bearing on rating alone: line contact gives 224 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1030 skids at 3,000 r/min and fails by smearing long before L10 fatigue.", "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N1030?", "a": "N1030 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1030 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1030 is supplied in the standard open execution shown in the table." }, { "q": "Can N1030 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N1030?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N1030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n1030", "N1030" ], "locale_variants": {} }, { "sku": "NJ1030", "brand": "NTN", "manufacturer_designation": "NTN NJ1030", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 224, "static_load_kN": 294, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 4700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1030 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 224 kN dynamic rating in the 150 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1030 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The 37.5 mm radial section ((225−150)/2) frames the roller complement; capacity per millimetre of bore is about 1.5 kN/mm before application factors. Mass 4700 g for the 150×225×35 mm NJ1030 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g NJ1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 225 mm race brinells and releases as vibration within hours.", "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 225×35 mm envelope matches.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The 37.5 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 35 mm-wide cavity.", "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1030?", "a": "NJ1030 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1030 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1030 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ1030 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ1030?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ1030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj1030", "NJ1030" ], "locale_variants": {} }, { "sku": "NN3030", "brand": "NTN", "manufacturer_designation": "NTN NN3030", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 585, "fatigue_load_limit_kN": 59, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 7810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NN3030 on the 150×225 mm envelope, 56 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,600 r/min. Numbering ties NN3030 to its envelope: type code NN, series NN3000, 150 mm bore; the 225×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 370 kN and C0 585 kN (C0/C ≈ 1.58) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 2,600 r/min is .84 of the 3,100 r/min oil value for NN3030; grease-churn heating closes that gap as fill quantity rises. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7810 g NN3030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3030 skids at 2,600 r/min and fails by smearing long before L10 fatigue.", "Do not replace NN3030 with a deep-groove ball bearing on rating alone: line contact gives 370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The NN rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 225×56 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3030 skids at 2,600 r/min and fails by smearing long before L10 fatigue.", "The 370/585 kN ratings, 59 kN Pu and 7810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3030?", "a": "NN3030 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 585 kN, Pu 59 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 7810 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3030 is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3030 is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3030?", "a": "NN3030 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat." }, { "q": "What speeds and lubrication apply to NN3030?", "a": "NTN rates NN3030 at 2,600 r/min with grease and 3,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3030", "NN3030" ], "locale_variants": {} }, { "sku": "NN3030K", "brand": "NTN", "manufacturer_designation": "NTN NN3030K", "series": "NN3000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 585, "fatigue_load_limit_kN": 59, "limiting_speed_rpm": 2600, "max_rpm": 2600, "speed_oil_rpm": 3100, "weight_g": 7530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3030K appears as a 150 mm bore single-row cylindrical roller bearing (370 kN C / 585 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). The roller-set pitch sits inside the 37.5 mm radial section between the 150 mm bore and 225 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Mass 7530 g for the 150×225×56 mm NN3030K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "coordinate-measuring and semiconductor-equipment drives", "machine-tool main spindles requiring high radial stiffness", "precision gearbox and indexing-drive shafts", "high-rpm motorised grinding and milling spindles" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7530 g NN3030K ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NN3030K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The NN rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 225×56 mm envelope matches.", "The 370/585 kN ratings, 59 kN Pu and 7530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3030K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NN3030K?", "a": "NN3030K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 585 kN, Pu 59 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 7530 g. It is open, with a machined or stamped steel cage per the precision execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3030K is the NN execution." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3030K is supplied in the standard open execution shown in the table." }, { "q": "What does the K tapered bore mean on a precision NN bearing like NN3030K?", "a": "The K suffix denotes a 1:12 tapered bore. NN3030K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3030 execution of the same envelope mounts on a plain seat." }, { "q": "What speeds and lubrication apply to NN3030K?", "a": "NTN rates NN3030K at 2,600 r/min with grease and 3,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone." } ], "cross_ref": [ { "equiv_sku": "NN3030K", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nn3030k", "NN3030K" ], "locale_variants": {} }, { "sku": "NU1030", "brand": "NTN", "manufacturer_designation": "NTN NU1030", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 224, "static_load_kN": 294, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 4700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU1030 on the 150×225 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Numbering ties NU1030 to its envelope: type code NU, series NU1000, 150 mm bore; the 225×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 3,500 r/min with oil versus 3,000 r/min with grease (a 500 r/min band), lubrication choice for NU1030 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g NU1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 224/294 kN pair here belongs to NU1030 as printed, not to the bare size.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for NU1030: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1030?", "a": "NU1030 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1030 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1030 is supplied in the standard open execution shown in the table." }, { "q": "Can NU1030 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU1030?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU1030-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu1030", "NU1030" ], "locale_variants": {} }, { "sku": "NUP1030", "brand": "NTN", "manufacturer_designation": "NTN NUP1030", "series": "NUP1000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 224, "static_load_kN": 294, "fatigue_load_limit_kN": 29.6, "limiting_speed_rpm": 3000, "max_rpm": 3000, "speed_oil_rpm": 3500, "weight_g": 4700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP1030 on the 150×225 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Numbering ties NUP1030 to its envelope: type code NUP, series NUP1000, 150 mm bore; the 225×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 224 kN and C0 294 kN (C0/C ≈ 1.31) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Selection arithmetic: Pu 29.6 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.31 (294/224 kN) shows the high-static-capacity proportioning of this 150 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1030.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g NUP1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 224/294 kN pair here belongs to NUP1030 as printed, not to the bare size.", "The NUP rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 225×35 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 224/294 kN pair here belongs to NUP1030 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1030 skids at 3,000 r/min and fails by smearing long before L10 fatigue.", "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP1030?", "a": "NUP1030 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1030 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1030 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP1030 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP1030?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP1030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup1030", "NUP1030" ], "locale_variants": {} }, { "sku": "N2230", "brand": "NTN", "manufacturer_designation": "NTN N2230", "series": "N2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 555, "static_load_kN": 710, "fatigue_load_limit_kN": 69.5, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N2230 is the wide (22) section of the NTN N2200 dimension series for a 150 mm shaft — 555 kN of basic dynamic capacity in a 16000 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 270 mm OD and 73 mm width from the ISO 15 general plan. The 73 mm width and 60.0 mm section put the N2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 150 mm (5.906 in) bore and 270 mm (10.63 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 73 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g N2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The N rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/710 kN pair here belongs to N2230 as printed, not to the bare size.", "Open N2230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.", "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2230?", "a": "N2230 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2230 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2230 is supplied in the standard open execution shown in the table." }, { "q": "Can N2230 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2230", "N2230" ], "locale_variants": {} }, { "sku": "N230", "brand": "NTN", "manufacturer_designation": "NTN N230", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 435, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 9720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists N230 on the 150×270 mm envelope, 45 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,500 r/min. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 182 mm and Ew 238 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. Equivalent-load planning treats N230 as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g N230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use N230 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.", "The N rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.", "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N230?", "a": "N230 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N230 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N230 is supplied in the standard open execution shown in the table." }, { "q": "Can N230 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n230", "N230" ], "locale_variants": {} }, { "sku": "NF230", "brand": "NTN", "manufacturer_designation": "NTN NF230", "series": "NF200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 435, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 9720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NF230 denotes a 150×270×45 mm (5.906 × 10.63 × 1.772 in) cylindrical roller bearing in the NF200 family, a pressed sheet-steel cage. Numbering ties NF230 to its envelope: type code NF, series NF200, 150 mm bore; the 270×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,900 r/min with oil versus 2,500 r/min with grease (a 400 r/min band), lubrication choice for NF230 is a thermal decision, not just a sealing one. Rating life at 380 kN C assumes clean oil and adequate film; the 42.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NF230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NF230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.", "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "If the shaft must be located both ways, do not use NF230 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NF230: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF230?", "a": "NF230 is an NTN NF single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF230 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF230 is supplied in the standard open execution shown in the table." }, { "q": "Can NF230 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf230", "NF230" ], "locale_variants": {} }, { "sku": "NJ2230", "brand": "NTN", "manufacturer_designation": "NTN NJ2230", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 555, "static_load_kN": 710, "fatigue_load_limit_kN": 69.5, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2230 appears as a 150 mm bore single-row cylindrical roller bearing (555 kN C / 710 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ2230 to its envelope: type code NJ, series NJ2200, 150 mm bore; the 270×73 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 182 mm and Ew 238 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. The 3.7 kN-per-mm-bore figure (555 kN over 150 mm) lets a NJ2230 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2230 non-locating position preloads the bearing when the shaft grows.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NJ2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/710 kN pair here belongs to NJ2230 as printed, not to the bare size.", "Do not replace NJ2230 with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.", "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2230?", "a": "NJ2230 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2230 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2230 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2230 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2230-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2230", "NJ2230" ], "locale_variants": {} }, { "sku": "NJ2230E", "brand": "NTN", "manufacturer_designation": "NTN NJ2230E", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 980, "fatigue_load_limit_kN": 95.5, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2230E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 735 kN dynamic rating in the 150 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2230E floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 2,000 r/min is .83 of the 2,400 r/min oil value for NJ2230E; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NJ2230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.", "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/980 kN pair here belongs to NJ2230E as printed, not to the bare size.", "The 735/980 kN ratings, 95.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2230E?", "a": "NJ2230E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 980 kN, Pu 95.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2230E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2230E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2230E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2230E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2230E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2230e", "NJ2230E" ], "locale_variants": {} }, { "sku": "NJ230", "brand": "NTN", "manufacturer_designation": "NTN NJ230", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 435, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 9720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NJ230: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,500 r/min on grease and 2,900 r/min on oil. Numbering ties NJ230 to its envelope: type code NJ, series NJ200, 150 mm bore; the 270×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 182 mm and Ew 238 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. Equivalent-load planning treats NJ230 as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ230 non-locating position preloads the bearing when the shaft grows.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NJ230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.", "Open NJ230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.", "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.", "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.", "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ230?", "a": "NJ230 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ230 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ230 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ230 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ230-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj230", "NJ230" ], "locale_variants": {} }, { "sku": "NJ230E", "brand": "NTN", "manufacturer_designation": "NTN NJ230E", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 495, "static_load_kN": 595, "fatigue_load_limit_kN": 58, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ230E appears as a 150 mm bore single-row cylindrical roller bearing (495 kN C / 595 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ230E floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 182 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. Equivalent-load planning treats NJ230E as a pure radial bearing: keep P below 495 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ230E non-locating position preloads the bearing when the shaft grows.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NJ230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ230E skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.", "The 495/595 kN ratings, 58 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ230E?", "a": "NJ230E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 595 kN, Pu 58 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ230E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ230E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ230E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ230E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ230E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj230e", "NJ230E" ], "locale_variants": {} }, { "sku": "NU2230", "brand": "NTN", "manufacturer_designation": "NTN NU2230", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 555, "static_load_kN": 710, "fatigue_load_limit_kN": 69.5, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NU2230: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2230 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NU2230 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 16000 g for the 150×270×73 mm NU2230 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "rolling-contact fatigue after the catalogue L10 life is exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NU2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Do not replace NU2230 with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2230?", "a": "NU2230 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2230 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2230 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2230 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2230-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2230", "NU2230" ], "locale_variants": {} }, { "sku": "NU2230E", "brand": "NTN", "manufacturer_designation": "NTN NU2230E", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 980, "fatigue_load_limit_kN": 95.5, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2230E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 150×270×73 mm ISO 15 envelope. Numbering ties NU2230E to its envelope: type code NU, series NU2200, 150 mm bore; the 270×73 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 60.0 mm radial section ((270−150)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Rating life at 735 kN C assumes clean oil and adequate film; the 95.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NU2230E; an oversized radius locks the ring on its face and tilts the 73 mm-wide seat.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NU2230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2230E skids at 2,000 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NU2230E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.", "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.", "The 735/980 kN ratings, 95.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2230E?", "a": "NU2230E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 980 kN, Pu 95.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2230E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2230E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2230E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2230E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2230E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2230e", "NU2230E" ], "locale_variants": {} }, { "sku": "NU230", "brand": "NTN", "manufacturer_designation": "NTN NU230", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 435, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 9720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU230 is the standard section of the NTN NU200 dimension series for a 150 mm shaft — 380 kN of basic dynamic capacity in a 9720 g, open bearing. Digit by digit, NU230 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,500 r/min grease and 2,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 150 mm bore. Speed ratio check: limiting 2,500 r/min is .86 of the 2,900 r/min oil value for NU230; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU230 non-locating position preloads the bearing when the shaft grows.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "fretting corrosion on a loose rotating shaft seat", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NU230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.", "Open NU230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.", "If the shaft must be located both ways, do not use NU230 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU230?", "a": "NU230 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU230 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU230 is supplied in the standard open execution shown in the table." }, { "q": "Can NU230 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU230-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu230", "NU230" ], "locale_variants": {} }, { "sku": "NU230E", "brand": "NTN", "manufacturer_designation": "NTN NU230E", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 495, "static_load_kN": 595, "fatigue_load_limit_kN": 58, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NU230E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. Digit by digit, NU230E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU230E designation when purchasing. Equivalent-load planning treats NU230E as a pure radial bearing: keep P below 495 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU230E; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NU230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/595 kN pair here belongs to NU230E as printed, not to the bare size.", "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NU230E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The 495/595 kN ratings, 58 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU230E?", "a": "NU230E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 595 kN, Pu 58 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU230E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU230E is supplied in the standard open execution shown in the table." }, { "q": "Can NU230E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU230E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU230E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu230e", "NU230E" ], "locale_variants": {} }, { "sku": "NUP2230", "brand": "NTN", "manufacturer_designation": "NTN NUP2230", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 555, "static_load_kN": 710, "fatigue_load_limit_kN": 69.5, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2230 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 555 kN dynamic rating in the 150 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2230 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. With C 555 kN and C0 710 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 555 kN C assumes clean oil and adequate film; the 69.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 150 mm shaft.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NUP2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NUP2230: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2230 skids at 2,200 r/min and fails by smearing long before L10 fatigue.", "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2230?", "a": "NUP2230 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2230 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2230 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2230 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2230", "NUP2230" ], "locale_variants": {} }, { "sku": "NUP2230E", "brand": "NTN", "manufacturer_designation": "NTN NUP2230E", "series": "NUP2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 980, "fatigue_load_limit_kN": 95.5, "limiting_speed_rpm": 2000, "max_rpm": 2000, "speed_oil_rpm": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP2230E is the wide (22) section of the NTN NUP2200 dimension series for a 150 mm shaft — 735 kN of basic dynamic capacity in a open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 270 mm OD and 73 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass Dimensions 150×270×73 mm and the 735 kN C rating define the substitution envelope; check the 2203E mass column for this exact NUP2230E execution. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NUP2230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.", "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NUP2230E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/980 kN pair here belongs to NUP2230E as printed, not to the bare size.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/980 kN pair here belongs to NUP2230E as printed, not to the bare size.", "The 735/980 kN ratings, 95.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2230E?", "a": "NUP2230E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 980 kN, Pu 95.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2230E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2230E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2230E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2230E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2230E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2230e", "NUP2230E" ], "locale_variants": {} }, { "sku": "NUP230", "brand": "NTN", "manufacturer_designation": "NTN NUP230", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 435, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "speed_oil_rpm": 2900, "weight_g": 9720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP230 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 150×270×45 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 270 mm OD and 45 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP230. Rating life at 380 kN C assumes clean oil and adequate film; the 42.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "electrical pitting on VFD-driven motor shafts without grounding protection" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NUP230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 380/435 kN pair here belongs to NUP230 as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.", "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP230?", "a": "NUP230 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP230 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP230 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP230 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP230?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP230-ECJ", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup230", "NUP230" ], "locale_variants": {} }, { "sku": "NUP230E", "brand": "NTN", "manufacturer_designation": "NTN NUP230E", "series": "NUP200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 495, "static_load_kN": 595, "fatigue_load_limit_kN": 58, "limiting_speed_rpm": 2200, "max_rpm": 2200, "speed_oil_rpm": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NUP230E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 495 kN dynamic rating in the 150 mm bore. Digit by digit, NUP230E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 3.3 kN-per-mm-bore figure (495 kN over 150 mm) lets a NUP230E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP230E; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NUP230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/595 kN pair here belongs to NUP230E as printed, not to the bare size.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.", "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/595 kN pair here belongs to NUP230E as printed, not to the bare size.", "The 495/595 kN ratings, 58 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP230E?", "a": "NUP230E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 595 kN, Pu 58 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP230E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP230E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP230E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP230E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP230E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup230e", "NUP230E" ], "locale_variants": {} }, { "sku": "N2330", "brand": "NTN", "manufacturer_designation": "NTN N2330", "series": "N2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 1400, "fatigue_load_limit_kN": 132, "limiting_speed_rpm": 1900, "max_rpm": 1900, "speed_oil_rpm": 2200, "weight_g": 39800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number N2330 denotes a 150×320×108 mm (5.906 × 12.598 × 4.252 in) cylindrical roller bearing in the N2300 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N2330 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N2330. Thermal planning around the 1,900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,200 r/min for continuously high-duty 150 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g N2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for N2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The N rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N2330?", "a": "N2330 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2330 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2330 is supplied in the standard open execution shown in the table." }, { "q": "Can N2330 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N2330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N2330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n2330", "N2330" ], "locale_variants": {} }, { "sku": "N330", "brand": "NTN", "manufacturer_designation": "NTN N330", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 805, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_g": 24700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies N330: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,100 r/min on grease and 2,500 r/min on oil. Digit by digit, N330 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,500 r/min with oil versus 2,100 r/min with grease (a 400 r/min band), lubrication choice for N330 is a thermal decision, not just a sealing one. The 150 mm (5.906 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 65 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N330 non-locating position preloads the bearing when the shaft grows.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g N330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.", "If the shaft must be located both ways, do not use N330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 2,100 r/min and oil 2,500 r/min are different limits for N330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of N330?", "a": "N330 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N330 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N330 is supplied in the standard open execution shown in the table." }, { "q": "Can N330 take axial load and locate a shaft?", "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for N330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "N330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "n330", "N330" ], "locale_variants": {} }, { "sku": "NF330", "brand": "NTN", "manufacturer_designation": "NTN NF330", "series": "NF300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 805, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_g": 24700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NF330 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 150×320×65 mm ISO 15 envelope. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 65 mm width from the ISO 15 general plan. The 85.0 mm radial section ((320−150)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 150 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF330.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NF330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NF330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "The NF rib arrangement is not interchangeable with another prefix on the same 150 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 320×65 mm envelope matches.", "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.", "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NF330?", "a": "NF330 is an NTN NF single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF330 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF330 is supplied in the standard open execution shown in the table." }, { "q": "Can NF330 take axial load and locate a shaft?", "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NF330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NF330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nf330", "NF330" ], "locale_variants": {} }, { "sku": "NJ2330", "brand": "NTN", "manufacturer_designation": "NTN NJ2330", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 1400, "fatigue_load_limit_kN": 132, "limiting_speed_rpm": 1900, "max_rpm": 1900, "speed_oil_rpm": 2200, "weight_g": 39800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2330 is the extra-wide (23) section of the NTN NJ2300 dimension series for a 150 mm shaft — 1130 kN of basic dynamic capacity in a 39800 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 108 mm width from the ISO 15 general plan. At 2,200 r/min with oil versus 1,900 r/min with grease (a 300 r/min band), lubrication choice for NJ2330 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g NJ2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.", "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NJ2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2330 skids at 1,900 r/min and fails by smearing long before L10 fatigue.", "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NJ2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2330?", "a": "NJ2330 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2330 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2330 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2330 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2330-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×320×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2330", "NJ2330" ], "locale_variants": {} }, { "sku": "NJ2330E", "brand": "NTN", "manufacturer_designation": "NTN NJ2330E", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1290, "static_load_kN": 1600, "fatigue_load_limit_kN": 150, "limiting_speed_rpm": 1700, "max_rpm": 1700, "speed_oil_rpm": 2000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NJ2330E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 108 mm width from the ISO 15 general plan. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for NJ2330E is a thermal decision, not just a sealing one. The 150 mm (5.906 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 108 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2330E non-locating position preloads the bearing when the shaft grows.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of raceways in unfiltered oil or open arrangements", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NJ2330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Do not replace NJ2330E with a deep-groove ball bearing on rating alone: line contact gives 1290 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.", "If the shaft must be located both ways, do not use NJ2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NJ2330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 1290/1600 kN ratings, 150 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2330E?", "a": "NJ2330E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1290 kN, C0 1600 kN, Pu 150 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2330E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2330E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ2330E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ2330E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ2330E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj2330e", "NJ2330E" ], "locale_variants": {} }, { "sku": "NJ330", "brand": "NTN", "manufacturer_designation": "NTN NJ330", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 805, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_g": 24700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ330 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 735 kN dynamic rating in the 150 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ330 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The 85.0 mm radial section ((320−150)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Selection arithmetic: Pu 76 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.10 (805/735 kN) shows the high-static-capacity proportioning of this 150 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ330 non-locating position preloads the bearing when the shaft grows.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "roller-end and raceway scoring from inadequate oil flow under heavy radial load", "electrical pitting on VFD-driven motor shafts without grounding protection", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NJ330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/805 kN pair here belongs to NJ330 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.", "Do not replace NJ330 with a deep-groove ball bearing on rating alone: line contact gives 735 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.", "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.", "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ330?", "a": "NJ330 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ330 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ330 is supplied in the standard open execution shown in the table." }, { "q": "Can NJ330 take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ330-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj330", "NJ330" ], "locale_variants": {} }, { "sku": "NJ330E", "brand": "NTN", "manufacturer_designation": "NTN NJ330E", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 840, "static_load_kN": 920, "fatigue_load_limit_kN": 86.5, "limiting_speed_rpm": 1900, "max_rpm": 1900, "speed_oil_rpm": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ330E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 840 kN dynamic rating in the 150 mm bore. Numbering ties NJ330E to its envelope: type code NJ, series NJ300, 150 mm bore; the 320×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 840 kN and C0 920 kN (C0/C ≈ 1.10) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 150 mm (5.906 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 65 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ330E non-locating position preloads the bearing when the shaft grows.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "cage distortion after a mounting blow carried through the roller set", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "electrical pitting on VFD-driven motor shafts without grounding protection", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NJ330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Open NJ330E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ330E skids at 1,900 r/min and fails by smearing long before L10 fatigue.", "The 840/920 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ330E?", "a": "NJ330E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 840 kN, C0 920 kN, Pu 86.5 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ330E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ330E is supplied in the standard open execution shown in the table." }, { "q": "Can NJ330E take axial load and locate a shaft?", "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings." }, { "q": "What do Fw and Ew mean for NJ330E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NJ330E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nj330e", "NJ330E" ], "locale_variants": {} }, { "sku": "NU2330", "brand": "NTN", "manufacturer_designation": "NTN NU2330", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 1400, "fatigue_load_limit_kN": 132, "limiting_speed_rpm": 1900, "max_rpm": 1900, "speed_oil_rpm": 2200, "weight_g": 39800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU2330 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1130 kN dynamic rating in the 150 mm bore. Digit by digit, NU2330 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 193 mm and Ew 277 mm — the envelope inside the 150/320 mm bore/OD where the rollers actually run. Equivalent-load planning treats NU2330 as a pure radial bearing: keep P below 1130 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.", "applications": [ "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g NU2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "The NU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2330 skids at 1,900 r/min and fails by smearing long before L10 fatigue.", "The NU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.", "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2330?", "a": "NU2330 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2330 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2330 is supplied in the standard open execution shown in the table." }, { "q": "Can NU2330 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2330-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×320×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2330", "NU2330" ], "locale_variants": {} }, { "sku": "NU2330E", "brand": "NTN", "manufacturer_designation": "NTN NU2330E", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1290, "static_load_kN": 1600, "fatigue_load_limit_kN": 150, "limiting_speed_rpm": 1700, "max_rpm": 1700, "speed_oil_rpm": 2000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU2330E denotes a 150×320×108 mm (5.906 × 12.598 × 4.252 in) cylindrical roller bearing in the NU2300 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NU2330E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Selection arithmetic: Pu 150 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.24 (1600/1290 kN) shows the high-static-capacity proportioning of this 150 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling", "brinelling from static overload or impact during handling" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NU2330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NU2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "If the shaft must be located both ways, do not use NU2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NU2330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1290/1600 kN pair here belongs to NU2330E as printed, not to the bare size.", "The 1290/1600 kN ratings, 150 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2330E?", "a": "NU2330E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1290 kN, C0 1600 kN, Pu 150 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2330E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2330E is supplied in the standard open execution shown in the table." }, { "q": "Can NU2330E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU2330E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU2330E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu2330e", "NU2330E" ], "locale_variants": {} }, { "sku": "NU330", "brand": "NTN", "manufacturer_designation": "NTN NU330", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 805, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_g": 24700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The NTN order number NU330 denotes a 150×320×65 mm (5.906 × 12.598 × 2.559 in) cylindrical roller bearing in the NU300 family, a pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 65 mm width from the ISO 15 general plan. With C 735 kN and C0 805 kN (C0/C ≈ 1.10) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 150 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU330 non-locating position preloads the bearing when the shaft grows.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "micro-pitting when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NU330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/805 kN pair here belongs to NU330 as printed, not to the bare size.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.", "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU330?", "a": "NU330 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU330 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU330 is supplied in the standard open execution shown in the table." }, { "q": "Can NU330 take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU330-ECM", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu330", "NU330" ], "locale_variants": {} }, { "sku": "NU330E", "brand": "NTN", "manufacturer_designation": "NTN NU330E", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 840, "static_load_kN": 920, "fatigue_load_limit_kN": 86.5, "limiting_speed_rpm": 1900, "max_rpm": 1900, "speed_oil_rpm": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NU330E on the 150×320 mm envelope, 65 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,900 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,900 r/min grease and 2,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 150 mm bore. Rating life at 840 kN C assumes clean oil and adequate film; the 86.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.", "applications": [ "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage distortion after a mounting blow carried through the roller set", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NU330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "If the shaft must be located both ways, do not use NU330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330E skids at 1,900 r/min and fails by smearing long before L10 fatigue.", "If the shaft must be located both ways, do not use NU330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 840/920 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU330E?", "a": "NU330E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 840 kN, C0 920 kN, Pu 86.5 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU330E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU330E is supplied in the standard open execution shown in the table." }, { "q": "Can NU330E take axial load and locate a shaft?", "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)." }, { "q": "What do Fw and Ew mean for NU330E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NU330E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nu330e", "NU330E" ], "locale_variants": {} }, { "sku": "NUP2330", "brand": "NTN", "manufacturer_designation": "NTN NUP2330", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 1400, "fatigue_load_limit_kN": 132, "limiting_speed_rpm": 1900, "max_rpm": 1900, "speed_oil_rpm": 2200, "weight_g": 39800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2330 appears as a 150 mm bore single-row cylindrical roller bearing (1130 kN C / 1400 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP2330 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 39800 g for the 150×320×108 mm NUP2330 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.", "applications": [ "rolling-mill work-roll and backup-roll positions", "large turbine and generator rotor bearings", "wind-turbine gearbox planet and rotor shafts", "ship propulsion line shafts and reduction gears" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "false brinelling on standby machines exposed to external vibration", "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g NUP2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.", "If the shaft must be located both ways, do not use NUP2330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NUP2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1130/1400 kN pair here belongs to NUP2330 as printed, not to the bare size.", "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2330?", "a": "NUP2330 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2330 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2330 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2330 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2330", "NUP2330" ], "locale_variants": {} }, { "sku": "NUP2330E", "brand": "NTN", "manufacturer_designation": "NTN NUP2330E", "series": "NUP2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1290, "static_load_kN": 1600, "fatigue_load_limit_kN": 150, "limiting_speed_rpm": 1700, "max_rpm": 1700, "speed_oil_rpm": 2000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2330E appears as a 150 mm bore single-row cylindrical roller bearing (1290 kN C / 1600 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NUP2330E to its envelope: type code NUP, series NUP2300, 150 mm bore; the 320×108 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for NUP2330E is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2330E non-locating position preloads the bearing when the shaft grows.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "brinelling from static overload or impact during handling", "rolling-contact fatigue after the catalogue L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NUP2330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "The NUP rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.", "If the shaft must be located both ways, do not use NUP2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The NUP rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.", "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NUP2330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 1290/1600 kN ratings, 150 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP2330E?", "a": "NUP2330E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1290 kN, C0 1600 kN, Pu 150 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2330E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2330E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP2330E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP2330E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP2330E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup2330e", "NUP2330E" ], "locale_variants": {} }, { "sku": "NUP330", "brand": "NTN", "manufacturer_designation": "NTN NUP330", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 805, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2100, "max_rpm": 2100, "speed_oil_rpm": 2500, "weight_g": 24700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NTN lists NUP330 on the 150×320 mm envelope, 65 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,100 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 4.9 kN-per-mm-bore figure (735 kN over 150 mm) lets a NUP330 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.", "applications": [ "ship propulsion line shafts and reduction gears", "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload in the line-contact Hertzian zone", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "fretting corrosion on a loose rotating shaft seat", "hard-particle indentation of raceways in unfiltered oil or open arrangements" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NUP330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "If the shaft must be located both ways, do not use NUP330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.", "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/805 kN pair here belongs to NUP330 as printed, not to the bare size.", "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP330?", "a": "NUP330 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP330 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP330 is supplied in the standard open execution shown in the table." }, { "q": "Can NUP330 take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP330?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup330", "NUP330" ], "locale_variants": {} }, { "sku": "NUP330E", "brand": "NTN", "manufacturer_designation": "NTN NUP330E", "series": "NUP300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 840, "static_load_kN": 920, "fatigue_load_limit_kN": 86.5, "limiting_speed_rpm": 1900, "max_rpm": 1900, "speed_oil_rpm": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NUP330E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,900 r/min on grease and 2,300 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). At 2,300 r/min with oil versus 1,900 r/min with grease (a 400 r/min band), lubrication choice for NUP330E is a thermal decision, not just a sealing one. Speed ratio check: limiting 1,900 r/min is .83 of the 2,300 r/min oil value for NUP330E; grease-churn heating closes that gap as fill quantity rises. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 150 mm shaft.", "applications": [ "mining SAG/ball-mill drive shafts", "offshore drawworks and winch drums", "heavy press and large gearbox main shafts", "rolling-mill work-roll and backup-roll positions" ], "failure_modes": [ "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load", "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant", "grease starvation and cage drag when relubrication intervals are extended past the grease life", "rolling-contact fatigue after the catalogue L10 life is exceeded", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 150 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NUP330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.", "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.", "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.", "Open NUP330E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.", "Grease limiting speed 1,900 r/min and oil 2,300 r/min are different limits for NUP330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.", "The 840/920 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives." ], "faq": [ { "q": "What are the dimensions and catalogue data of NUP330E?", "a": "NUP330E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 840 kN, C0 920 kN, Pu 86.5 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution." }, { "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?", "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP330E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions." }, { "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?", "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP330E is supplied in the standard open execution shown in the table." }, { "q": "Can NUP330E take axial load and locate a shaft?", "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing." }, { "q": "What do Fw and Ew mean for NUP330E?", "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,300 r/min oil." } ], "cross_ref": [ { "equiv_sku": "NUP330E", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E", "extracted_at": "2026-10-01", "last_verified": "2026-10-01", "confidence_score": 0.7, "status": "published", "aliases": [ "nup330e", "NUP330E" ], "locale_variants": {} } ]